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Humans evolved to share beds – how your sleeping companions may affect you now

<a href="https://theconversation.com/profiles/goffredina-spano-2240566">Goffredina Spanò</a>, <a href="https://theconversation.com/institutions/kingston-university-949">Kingston University</a> and <a href="https://theconversation.com/profiles/gina-mason-2240569">Gina Mason</a>, <a href="https://theconversation.com/institutions/brown-university-1276">Brown University</a> <a href="https://www.cell.com/trends/ecology-evolution/fulltext/S0169-5347(24)00176-9">Recent research</a> on animal sleep behaviour has revealed that sleep is influenced by the animals around them. Olive baboons, for instance, sleep less as group sizes increase, while mice can synchronise their rapid eye movement (REM) cycles. In western society, many people expect to sleep alone, if not with a romantic partner. But as with other group-living animals, human co-sleeping is common, despite some <a href="https://www.sciencedirect.com/science/article/abs/pii/S1389945710000377">cultural</a> and <a href="https://www.sciencedirect.com/science/article/abs/pii/S2352721820303053?via%3Dihub">age-related variation</a>. And in many cultures, bedsharing with a relative is considered typical. Apart from <a href="https://www.sciencedirect.com/science/article/abs/pii/S1389945710000377">western countries</a>, caregiver-infant co-sleeping is common, with rates as high as <a href="https://www.sciencedirect.com/science/article/abs/pii/S1087079216000265">60-100%</a> in parts of South America, Asia and Africa. Despite its prevalence, infant co-sleeping is controversial. Some western perspectives, that value self-reliance, argue that sleeping alone promotes self-soothing when the baby wakes in the night. But <a href="https://www.tandfonline.com/doi/abs/10.1080/00221325.2021.1905599">evolutionary scientists argue</a> that co-sleeping has been important to help keep infants warm and safe throughout human existence. <a href="https://www.sleephealthjournal.org/article/S2352-7218(22)00077-8/abstract">Many cultures</a> do not expect babies to self-soothe when they wake in the night and see night wakings as a normal part of breastfeeding <a href="https://www.sciencedirect.com/science/article/pii/S1389945713002220?via%3Dihub">and development</a>. Concerns about Sudden Infant Death Syndrome (Sids) have often led paediatricians to discourage bed-sharing. However, when studies control for <a href="https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0107799">other Sids risk factors</a> including unsafe sleeping surfaces, Sids risk does not seem to differ statistically between co-sleeping and solitary sleeping infants. This may be one reason why agencies such as the <a href="https://publications.aap.org/pediatrics/article/150/1/e2022057990/188304/Sleep-Related-Infant-Deaths-Updated-2022?autologincheck=redirected">American Academy of Pediatrics</a>, the <a href="https://www.nice.org.uk/guidance/qs37/chapter/Quality-statement-5-Safer-practices-for-bed-sharing">National Institute for Health and Care Excellence</a> and the <a href="https://www.nhs.uk/conditions/baby/caring-for-a-newborn/reduce-the-risk-of-sudden-infant-death-syndrome/">NHS</a> either <a href="https://publications.aap.org/pediatrics/article/150/1/e2022057990/188304/Sleep-Related-Infant-Deaths-Updated-2022">recommend that</a> infants “sleep in the parents’ room, close to the parents’ bed, but on a separate surface,” or, if bedsharing, to make sure that the infant <a href="https://www.nice.org.uk/guidance/qs37/chapter/Quality-statement-5-Safer-practices-for-bed-sharing">“sleeps on a firm, flat mattress”</a> without pillows and duvets, rather than discouraging co-sleeping altogether. Researchers don’t yet know whether co-sleeping causes differences in sleep or, whether co-sleeping happens because of these differences. However, experiments in the 1990s suggested that co-sleeping can <a href="https://onlinelibrary.wiley.com/doi/10.1002/ajpa.20736">encourage more sustained and frequent bouts of breastfeeding</a>. Using sensors to measure brain activity, this research also suggested that infants’ and caregivers’ sleep may be lighter during co-sleeping. But researchers speculated that this lighter sleep may actually <a href="https://www.tandfonline.com/doi/full/10.1080/00221325.2021.1905599">help protect against Sids</a> by providing infants more opportunities to rouse from sleep and develop better control over their respiratory system. Other advocates believe that co-sleeping <a href="https://www.sciencedirect.com/science/article/abs/pii/S0163638319301237">benefits infants’ emotional and mental health</a> by promoting parent-child bonding and aiding infants’ <a href="https://www.tandfonline.com/doi/full/10.3109/10253890.2012.742057">stress hormone regulation</a>. However, current data is inconclusive, with most studies showing <a href="https://www.sciencedirect.com/science/article/abs/pii/S0163638319301249?via%3Dihub">mixed findings</a> or <a href="https://www.tandfonline.com/doi/full/10.1080/14616734.2024.2380427">no differences</a> between co-sleepers and solitary sleepers with respect to short and long-term mental health. <h2>Co-sleeping in childhood</h2> Childhood co-sleeping past infancy is also fairly common according to <a href="https://www.sciencedirect.com/science/article/abs/pii/S1389945713011076?via%3Dihub">worldwide surveys</a>. A <a href="https://publications.aap.org/pediatrics/article-abstract/126/5/e1119/65347/Relationship-Between-Bed-Sharing-and-Breastfeeding">2010 survey</a> of over 7,000 UK families found 6% of children were constant bedsharers up to at least four years old. Some families adopt co-sleeping <a href="https://capmh.biomedcentral.com/articles/10.1186/s13034-023-00607-w">in response to</a> their child having trouble sleeping. But child-parent bedsharing in many countries, including some western countries <a href="https://onlinelibrary.wiley.com/doi/10.1111/j.1471-6712.2005.00358.x">like Sweden</a> where children often co-sleep with parents until school age, is viewed culturally as part of a nurturing environment. It is also common for siblings to share a room or even a bed. A <a href="https://www.tandfonline.com/doi/full/10.1080/00221325.2021.1916732">2021 US study</a> found that over 36% of young children aged three to five years bedshared in some form overnight, whether with caregivers, siblings, pets or some combination. Co-sleeping decreases but is still present among older children, with up to <a href="https://onlinelibrary.wiley.com/doi/10.1111/fare.12955">13.8% of co-sleeping parents</a> in Australia, the UK and other countries reporting that their child was between five and 12 years old when they engaged in co-sleeping. Two recent US studies using wrist-worn actigraphs (motion sensors) to track sleep indicated that kids who bedshare may have <a href="https://jcsm.aasm.org/doi/10.5664/jcsm.11352">shorter sleep durations</a> than children who sleep alone. But this shorter sleep duration <a href="https://www.tandfonline.com/doi/full/10.1080/00221325.2021.1916732">is not explained by</a> greater disruption during sleep. Instead, bedsharing children may lose sleep by <a href="https://www.tandfonline.com/doi/full/10.1080/00221325.2021.1916732">going to bed later than</a> solitary sleepers. The benefits and downsides of co-sleeping may also differ in children with conditions such as <a href="https://www.sciencedirect.com/science/article/abs/pii/S1389945717303842">autism spectrum disorder</a>, <a href="https://link.springer.com/article/10.1007/s10802-017-0387-1">mental health disorders</a> and <a href="https://onlinelibrary.wiley.com/doi/10.1111/dmcn.13300">chronic illnesses</a>. These children may experience heightened anxiety, sensory sensitivities and physical discomfort that make falling and staying asleep difficult. For them, co-sleeping can provide <a href="https://link.springer.com/article/10.1007/s11325-018-1710-y">reassurance</a>. <h2>Adults sharing beds</h2> According to <a href="https://www.sleepfoundation.org/wp-content/uploads/2018/10/NSF_Bedroom_Poll_Report_1.pdf">a 2018 survey</a> from the US National Sleep Foundation, 80-89% of adults who live with their significant other share a bed with them. Adult bedsharing has shifted over time from pre-industrial <a href="https://academic.oup.com/ahr/article-abstract/106/2/343/64370?redirectedFrom=fulltext">communal arrangements</a>, including whole families and other household guests, to <a href="https://academic.oup.com/jdh/article-abstract/23/3/275/359439?redirectedFrom=fulltext">solo sleeping</a> in response to hygiene concerns as germ theory became accepted. Many couples find that bedsharing boosts their <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC1978364/">sense of closeness</a>. Research shows that bedsharing with your partner can lead to <a href="https://onlinelibrary.wiley.com/doi/10.1155/2017/8140672">longer sleep times</a> and a <a href="https://academic.oup.com/sleep/article-abstract/17/4/308/2753131">feeling of better sleep</a> overall. Bedsharing couples also often <a href="https://www.frontiersin.org/journals/psychiatry/articles/10.3389/fpsyt.2020.00583/full">get into sync</a> with each other’s sleep stages, which can enhance that feeling of intimacy. However, it’s not all rosy. Some studies indicate that females in heterosexual relationships may struggle more with sleep quality when bedsharing, as they can be <a href="https://link.springer.com/article/10.1111/j.1479-8425.2007.00320.x">more easily disturbed</a> by their male partner’s movements. Also, bedsharers can have less <a href="https://pubmed.ncbi.nlm.nih.gov/27624285/">deep sleep</a> than when sleeping alone, even though they feel like their sleep is better together. Many questions about co-sleeping remain unanswered. For instance, we don’t fully understand the developmental effects of co-sleeping on children, or the benefits of co-sleeping for adults beyond female-male romantic partners. But, some work suggests that co-sleeping can <a href="https://link.springer.com/article/10.1007/s11325-018-1710-y">comfort us</a>, similar to other <a href="https://onlinelibrary.wiley.com/doi/full/10.1111/jsr.14174">forms of social contact</a>, and help to enhance <a href="https://onlinelibrary.wiley.com/doi/10.1002/ajpa.20736">physical synchrony</a> between parents and children. Co-sleeping doesn’t have a one-size-fits-all answer. But remember that western norms aren’t necessarily the ones we have evolved with. So consider factors such as <a href="https://www.sciencedirect.com/science/article/abs/pii/S1389945716301265">sleep disorders</a>, health and age in your decision to co-sleep, rather than what everyone else is doing.<img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/241803/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /> <a href="https://theconversation.com/profiles/goffredina-spano-2240566">Goffredina Spanò</a>, Lecturer in Developmental Cognitive Neuroscience, <a href="https://theconversation.com/institutions/kingston-university-949">Kingston University</a> and <a href="https://theconversation.com/profiles/gina-mason-2240569">Gina Mason</a>, Postdoctoral Research Fellow in Psychiatry and Human Behaviour, <a href="https://theconversation.com/institutions/brown-university-1276">Brown University</a> Image credits: Shutterstock This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/humans-evolved-to-share-beds-how-your-sleeping-companions-may-affect-you-now-241803">original article</a>.

Body

How light tells you when to sleep, focus and poo

<a href="https://theconversation.com/profiles/frederic-gachon-1379094">Frederic Gachon</a>, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a> and <a href="https://theconversation.com/profiles/benjamin-weger-1646210">Benjamin Weger</a>, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a> Exposure to light is crucial for our physical and mental health, as this and future articles in the series will show. But the timing of that light exposure is also crucial. This tells our body to wake up in the morning, when to poo and the time of day to best focus or be alert. When we’re exposed to light also controls our body temperature, blood pressure and even chemical reactions in our body. But how does our body know when it’s time to do all this? And what’s light got to do with it? <h2>What is the body clock, actually?</h2> One of the key roles of light is to re-set our body clock, also known as the circadian clock. This works like an internal oscillator, similar to an actual clock, ticking away as you read this article. But rather than ticking you can hear, the body clock is a network of genes and proteins that regulate each other. This network sends signals to organs via hormones and the nervous system. These complex loops of interactions and communications have a rhythm of about 24 hours. In fact, we don’t have one clock, we have trillions of body clocks throughout the body. The central clock is in the hypothalamus region of the brain, and each cell in every organ has its own. These clocks work in concert to help us adapt to the daily cycle of light and dark, aligning our body’s functions with the time of day. However, our body clock is not precise and works to a rhythm of about 24 hours (24 hours 30 minutes on average). So every morning, the central clock needs to be reset, signalling the start of a new day. This is why light is so important. The central clock is directly connected to <a href="https://journals.sagepub.com/doi/abs/10.1177/07487304231225706">light-sensing cells</a> in our retinas (the back of the eye). This daily re-setting of the body clock with morning light is essential for ensuring our body works well, in sync with our environment. In parallel, <a href="https://theconversation.com/does-it-matter-what-time-of-day-i-eat-and-can-intermittent-fasting-improve-my-health-heres-what-the-science-says-203762">when we eat food</a> also plays a role in re-setting the body clock, but this time the clock in organs other than the brain, such as the liver, kidneys or the gut. So it’s easy to see how our daily routines are closely linked with our body clocks. And in turn, our body clocks shape how our body works at set times of the day. <h2>What time of day?</h2> <figure class="align-center zoomable"><a href="https://images.theconversation.com/files/627494/original/file-20241023-14-729bed.gif?ixlib=rb-4.1.0&q=45&auto=format&w=1000&fit=clip"><img src="https://images.theconversation.com/files/627494/original/file-20241023-14-729bed.gif?ixlib=rb-4.1.0&q=45&auto=format&w=754&fit=clip" sizes="(min-width: 1466px) 754px, (max-width: 599px) 100vw, (min-width: 600px) 600px, 237px" srcset="https://images.theconversation.com/files/627494/original/file-20241023-14-729bed.gif?ixlib=rb-4.1.0&q=45&auto=format&w=600&h=450&fit=crop&dpr=1 600w, https://images.theconversation.com/files/627494/original/file-20241023-14-729bed.gif?ixlib=rb-4.1.0&q=30&auto=format&w=600&h=450&fit=crop&dpr=2 1200w, https://images.theconversation.com/files/627494/original/file-20241023-14-729bed.gif?ixlib=rb-4.1.0&q=15&auto=format&w=600&h=450&fit=crop&dpr=3 1800w, https://images.theconversation.com/files/627494/original/file-20241023-14-729bed.gif?ixlib=rb-4.1.0&q=45&auto=format&w=754&h=566&fit=crop&dpr=1 754w, https://images.theconversation.com/files/627494/original/file-20241023-14-729bed.gif?ixlib=rb-4.1.0&q=30&auto=format&w=754&h=566&fit=crop&dpr=2 1508w, https://images.theconversation.com/files/627494/original/file-20241023-14-729bed.gif?ixlib=rb-4.1.0&q=15&auto=format&w=754&h=566&fit=crop&dpr=3 2262w" alt="" /></a><figcaption>Matt Garrow/The Conversation. <a class="source" href="https://delos.com/blog/why-natural-light-is-important-for-mental-and-physical-health/">Adapted from Delos</a>, <a class="license" href="http://creativecommons.org/licenses/by/4.0/">CC BY</a></figcaption></figure> <h2>Let’s take a closer look at sleep</h2> The naturally occurring brain hormone <a href="https://pubmed.ncbi.nlm.nih.gov/30311830/">melatonin</a> is linked to our central clock and makes us feel sleepy at certain times of day. When it’s light, our body stops making melatonin (its production is inhibited) and we are alert. Closer to bedtime, the hormone is made, then secreted, making us feel drowsy. Our sleep is also <a href="https://www.frontiersin.org/journals/physiology/articles/10.3389/fphys.2019.00944/full">partly controlled</a> by <a href="https://www.annualreviews.org/content/journals/10.1146/annurev-genom-121222-120306">our genes</a>, which are part of our central clock. These genes influence our <a href="https://theconversation.com/does-it-matter-what-time-i-go-to-bed-198146">chronotype</a> – whether we are a “lark” (early riser), “night owl” (late sleeper) or a “dove” (somewhere in between). But exposure to light at night when we are supposed to be sleeping can have harmful effects. Even dim light from light pollution can impair our <a href="https://www.pnas.org/doi/10.1073/pnas.2113290119">heart rate and how we metabolise sugar</a> (glucose), may lead to <a href="https://doi.org/10.1038/s44220-023-00135-8">psychiatric disorders</a> such as depression, anxiety and bipolar disorder, and increases the overall risk of <a href="https://www.pnas.org/doi/10.1073/pnas.2405924121">premature death</a>. The main reason for these harmful effects is that light “at the wrong time” disturbs the body clock, and these effects are more pronounced for “night owls”. This “misaligned” exposure to light is also connected to the detrimental health effects we often see in people who <a href="https://theconversation.com/why-does-night-shift-increase-the-risk-of-cancer-diabetes-and-heart-disease-heres-what-we-know-so-far-190652">work night shifts</a>, such as an increased risk of cancer, diabetes and heart disease. <h2>How about the gut?</h2> Digestion also follows a circadian rhythm. Muscles in the colon that help move waste <a href="https://doi.org/10.1111/j.1572-0241.2004.40453.x">are more active</a> during the day and slow down at night. The most significant increase in colon movement starts at 6.30am. This is one of the reasons why most people feel the urge to poo <a href="https://theconversation.com/why-do-i-poo-in-the-morning-a-gut-expert-explains-229624">in the early morning</a> rather than at night. The gut’s day-night rhythm is a direct result of the action of the gut’s own clock and the central clock (which synchronises the gut with the rest of the body). It’s also influenced by when we eat. <h2>How about focusing?</h2> Our body clock also helps control our attention and alertness levels by changing how our brain functions at certain times of day. Attention and alertness levels improve in the afternoon and evening but dip during the night and early morning. Those fluctuations <a href="https://www.frontiersin.org/journals/molecular-neuroscience/articles/10.3389/fnmol.2012.00050/full">impact performance</a> and can lead to decreased productivity and an <a href="https://www.nature.com/articles/s41598-019-40914-x">increased risk</a> of errors and accidents during the less-alert hours. So it’s important to perform certain tasks that <a href="https://pubmed.ncbi.nlm.nih.gov/30923475/">require our attention</a> at certain times of day. That includes driving. In fact, disruption of the circadian clock at the start of daylight savings – when our body hasn’t had a chance to adapt to the clocks changing – <a href="https://www.sciencedirect.com/science/article/pii/S0960982219316781?via%3Dihub">increases the risk</a> of a car accident, particularly in the morning. <h2>What else does our body clock control?</h2> Our body clock influences many other aspects of our biology, including: <ul> <li>physical performance by controlling the activity of our <a href="https://doi.org/10.1038/s41574-023-00805-8">muscles</a></li> <li>blood pressure by controlling the <a href="https://theconversation.com/what-time-of-day-should-i-take-my-medicine-125809">system of hormones</a> involved in regulating our blood volume and blood vessels</li> <li>body temperature by controlling our metabolism and our level of physical activity</li> <li>how our body handles drugs and toxins by <a href="https://doi.org/10.1080/17460441.2023.2224554">controlling enzymes</a> involved in how the liver and kidneys eliminate these substances from the body.</li> </ul> <h2>Morning light is important</h2> But what does this all mean for us? Exposure to light, especially in the morning, is crucial for synchronising our circadian clock and bodily functions. As well as setting us up for a good night’s sleep, increased morning light exposure benefits our <a href="https://www.sciencedirect.com/science/article/pii/S0165032721008612?via%3Dihub">mental health</a> and <a href="https://academic.oup.com/jcem/article/101/9/3539/2806883">reduces the risk of obesity</a>. So boosting our exposure to morning light – for example, by going for a walk, or having breakfast outside – can directly benefit our mental and metabolic health. However, there are other aspects about which we have less control, including <a href="https://www.sciencedirect.com/science/article/pii/S0168952524001100">the genes</a> that control our body clock.<img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/236780/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /> <a href="https://theconversation.com/profiles/frederic-gachon-1379094">Frederic Gachon</a>, Associate Professor, Physiology of Circadian Rhythms, Institute for Molecular Bioscience, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a> and <a href="https://theconversation.com/profiles/benjamin-weger-1646210">Benjamin Weger</a>, NHMRC Emerging Leadership Fellow Institute for Molecular Bioscience, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a> Image credits: Shutterstock This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/how-light-tells-you-when-to-sleep-focus-and-poo-236780">original article</a>.

Body

What to claim for lost, delayed or damaged bags on overseas flights

<a href="https://theconversation.com/profiles/rebecca-johnston-123333">Rebecca Johnston</a>, <a href="https://theconversation.com/institutions/university-of-notre-dame-australia-852">University of Notre Dame Australia</a> and <a href="https://theconversation.com/profiles/david-hodgkinson-6574">David Hodgkinson</a>, <a href="https://theconversation.com/institutions/the-university-of-western-australia-1067">The University of Western Australia</a> If you get on a plane and your baggage ends up being delayed, damaged or lost, who’s responsible: you or the airline? And what rules apply when you’re flying between different countries – even if you don’t have travel insurance? Airlines (otherwise known as carriers) generally include baggage requirements in their terms and conditions of carriage, which are set out or referred to on your ticket. These are the rules that apply to the journey that you have booked. But for international flights, a carrier’s liability for damage, loss or delay of baggage is governed by a number of overarching international treaties, which many passengers aren’t aware of. <h2>International agreements</h2> The <a href="http://www.jus.uio.no/lm/air.carriage.warsaw.convention.1929/doc.html">Warsaw Convention</a> of 1929 was the first of these treaties, and the latest is the passenger-friendly 1999 <a href="http://www.jus.uio.no/lm/air.carriage.unification.convention.montreal.1999/">Montreal Convention</a>. In order for one of these treaties to apply to a particular journey, the same treaty must be in place at the point of departure and the passenger’s final destination. For many trips, the agreement that will apply will be the Montreal Convention, which has to date <a href="http://www.icao.int/secretariat/legal/List%20of%20Parties/Mtl99_EN.pdf">108 state parties</a>, covering everywhere from Albania and Australia to Zambia. In time, the Montreal Convention is expected to apply to almost all air travel. The Warsaw Convention (as amended by the <a href="http://www.jus.uio.no/lm/air.carriage.warsaw.convention.hague.protocol.1955/doc.html">Hague Protocol</a> and <a href="http://www.jus.uio.no/lm/air.carriage.warsaw.convention.montreal.protocol.4.1975/doc.html">Montreal Protocol No. 4</a>) will generally apply where the Montreal Convention does not. It is less favourable to passengers. All these treaties have similar provisions to deal with baggage claims – but very different limits to what you might get if you need to make a claim. <h2>What the airline is responsible for</h2> A carrier is liable if your checked baggage is lost, delayed or damaged regardless of fault. This is so unless the damage resulted from the inherent defect or quality of the baggage or, in terms of delay, if it proves that it took all reasonable measures to avoid the damage occasioned by that delay. As for unchecked baggage (that is, carry-on baggage), the carrier is only liable if the damage is due to the fault of the carrier or its agents. Unless otherwise specified, reference to “baggage” includes both checked and unchecked baggage. <h2>Calculating baggage compensation</h2> Under the Warsaw Convention (as amended by the <a href="http://www.jus.uio.no/lm/air.carriage.warsaw.convention.hague.protocol.1955/doc.html">Hague Protocol</a> and <a href="http://www.jus.uio.no/lm/air.carriage.warsaw.convention.montreal.protocol.4.1975/doc.html">Montreal Protocol No. 4</a>) and the Montreal Convention, liability limits are expressed in <a href="http://www.imf.org/external/np/exr/facts/sdr.HTM">special drawing rights</a> (SDRs). An SDR is a type of foreign exchange reserve asset created by the International Monetary Fund. Its value is based on an artificial basket of currencies consisting of the US dollar, the euro, the pound and the Japanese yen. The liability limits are reviewed every five years. As of October 16, 2014, the <a href="http://www.imf.org/external/np/fin/data/param_rms_mth.aspx">value of an SDR</a> is about US$1.49, £0.93 or A$1.70. Current SDR values for other currencies are also listed <a href="http://www.imf.org/external/np/fin/data/param_rms_mth.aspx">here</a>. <h2>So what is your baggage worth?</h2> In terms of baggage liability limits, the Warsaw Convention is of relatively little assistance to passengers. If your international travel is subject to Warsaw (for example, if you flew out of the United States on a one way ticket to Guatemala), liability for delayed, damaged or lost baggage is limited to 17 SDRs (about US$25.33, £15.81 or A$28.90) per kilogram per passenger for checked baggage and 332 SDRs (about US$494.68, £308.76 or A$564.40) per passenger for unchecked baggage. In contrast, a carrier is liable to pay far greater damages if the Montreal Convention applies. For any travel covered by Montreal, the carrier’s liability for baggage is limited to 1131 SDRs per passenger (US$1685.19, £1051.83 or A$1922.70), unless otherwise declared. The carrier is not liable for damages caused by delay if the carrier took all reasonable measures, or if it was impossible for it to take such measures. <h2>Time limits on baggage claims</h2> Time limits are imposed on making a claim for delayed, damaged or lost baggage. Any potential claims should be made to a carrier in writing within these specified limits. Article 26 of Warsaw provides that any complaint as to delay of baggage must be made at the latest within 21 days from the date the baggage was placed at the passenger’s disposal. <figure class="align-right zoomable"></figure> Similarly, under Article 31 of Montreal, a complaint must be made within 21 days of a passenger receiving their baggage. With respect to damaged baggage, under Warsaw, any claim must be made “forthwith” after the discovery of the damage and at most seven days from the date of receipt of the baggage. Montreal also gives passengers seven days from receipt of checked bags to report a damage claim. Neither convention imposes a time limit for reporting lost baggage claims. But it is advisable that you make your complaint as soon as possible. Warsaw does not state when baggage is considered “lost”, leaving it up to carriers to make that ruling. Under Montreal, baggage is only considered lost after 21 days or if the carrier admits that they have lost it. If a passenger fails to make a complaint within the specified times, the carrier will not be liable unless there has been fraud on the carrier’s part. <h2>Insurance alternatives</h2> If you are concerned that the contents of your baggage exceed the liability limits outlined above, you can make a special declaration of the value of your baggage prior to check-in and pay any additional fee (if required). In this case, the carrier will be liable to pay a higher amount, unless it is proved that the declared amount is greater than the actual value of your baggage. Alternatively, prior to travelling, check with your insurance company as to whether your travel insurance covers any excess from delayed, damaged or lost baggage. You might also want to <a href="http://www.icao.int/secretariat/legal/List%20of%20Parties/Mtl99_EN.pdf">check this list</a> to see whether the places you’re departing from and finally arriving at are parties to the Montreal Convention. If not, you might just find yourself out of pocket.<img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/32111/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /> <a href="https://theconversation.com/profiles/rebecca-johnston-123333">Rebecca Johnston</a>, Adjunct Lecturer, Law School, <a href="https://theconversation.com/institutions/university-of-notre-dame-australia-852">University of Notre Dame Australia</a> and <a href="https://theconversation.com/profiles/david-hodgkinson-6574">David Hodgkinson</a>, Associate Professor, Law School, <a href="https://theconversation.com/institutions/the-university-of-western-australia-1067">The University of Western Australia</a> Image credits: Shutterstock This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/what-to-claim-for-lost-delayed-or-damaged-bags-on-overseas-flights-32111">original article</a>.

Travel Trouble

An unbroken night’s sleep is a myth. Here’s what good sleep looks like

<a href="https://theconversation.com/profiles/amy-reynolds-424346">Amy Reynolds</a>, <a href="https://theconversation.com/institutions/flinders-university-972">Flinders University</a>; <a href="https://theconversation.com/profiles/claire-dunbar-1651340">Claire Dunbar</a>, <a href="https://theconversation.com/institutions/flinders-university-972">Flinders University</a>; <a href="https://theconversation.com/profiles/gorica-micic-187159">Gorica Micic</a>, <a href="https://theconversation.com/institutions/flinders-university-972">Flinders University</a>; <a href="https://theconversation.com/profiles/hannah-scott-424633">Hannah Scott</a>, <a href="https://theconversation.com/institutions/flinders-university-972">Flinders University</a>, and <a href="https://theconversation.com/profiles/nicole-lovato-60684">Nicole Lovato</a>, <a href="https://theconversation.com/institutions/flinders-university-972">Flinders University</a> What do you imagine a good night’s sleep to be? Often when people come into our sleep clinic seeking treatment, they share ideas about healthy sleep. Many think when their head hits the pillow, they should fall into a deep and restorative sleep, and emerge after about eight hours feeling refreshed. They’re in good company – many Australians hold <a href="https://doi.org/10.1016/j.jpsychores.2014.09.011">the same belief</a>. In reality, healthy sleep is cyclic across the night, as you move in and out of the different stages of sleep, often waking up several times. Some people remember one or more of these awakenings, others do not. Let’s consider what a healthy night’s sleep looks like. <h2>Sleep cycles are a roller-coaster</h2> As an adult, our sleep moves through <a href="https://www.sleepfoundation.org/stages-of-sleep">different cycles</a> and brief awakenings during the night. Sleep cycles last roughly 90 minutes each. We typically start the night with lighter sleep, before moving into deeper sleep stages, and rising again into rapid eye movement (REM) sleep – the stage of sleep often linked to vivid dreaming. If sleeping well, we get most of our deep sleep in the first half of the night, with <a href="https://www.nhlbi.nih.gov/health/sleep/stages-of-sleep#:%7E:text=During%20REM%20sleep%2C%20your%20eyes,from%20acting%20out%20your%20dreams">REM sleep</a> more common in the second half of the night. Adults usually move through five or six sleep cycles in a night, and it is entirely <a href="https://doi.org/10.1016/j.jpsychores.2014.09.011">normal</a> to wake up briefly at the end of each one. That means we might be waking up five times during the night. This can increase with older age and still be healthy. If you’re not remembering these awakenings that’s OK – they can be quite brief. <h2>What does getting a ‘good’ sleep actually mean?</h2> You’ll often hear that adults <a href="https://www.sleephealthfoundation.org.au/sleep-topics/how-much-sleep-do-you-really-need#:%7E:text=Sleep%20requirements%20stabilise%20in%20early,their%20best%20the%20next%20day">need between seven and nine hours</a> of sleep per night. But good sleep is about more than the number of hours – it’s also about the quality. For most people, sleeping well means being able to fall asleep soon after getting into bed (within around 30 minutes), sleeping without waking up for long periods, and waking feeling rested and ready for the day. You shouldn’t be feeling excessively sleepy during the day, especially if you’re regularly getting at least seven hours of refreshing sleep a night (this is a rough rule of thumb). But are you noticing you’re feeling physically tired, needing to nap regularly and still not feeling refreshed? It may be worthwhile touching base with your general practitioner, as there a range of possible reasons. <h2>Common issues</h2> Sleep disorders are common. Up to <a href="https://pubmed.ncbi.nlm.nih.gov/35478719/">25% of adults</a> have insomnia, a sleep disorder where it may be hard to fall or stay asleep, or you may wake earlier in the morning than you’d like. Rates of common sleep disorders such as insomnia and <a href="https://www.mayoclinic.org/diseases-conditions/sleep-apnea/symptoms-causes/syc-20377631">sleep apnoea</a> – where your breathing can partially or completely stop many times during the night – also increase with age, affecting <a href="https://pubmed.ncbi.nlm.nih.gov/32280974/">20% of early adults</a> and 40% of people in <a href="https://pubmed.ncbi.nlm.nih.gov/35082023/">middle age</a>. There are effective treatments, so asking for help is important. Beyond sleep disorders, our sleep can also be disrupted by chronic health conditions – such as <a href="https://www.sciencedirect.com/science/article/abs/pii/S0012369218311139">pain</a> – and by <a href="https://onlinelibrary.wiley.com/doi/10.1111/jsr.13075">certain medications</a>. There can also be other reasons we’re not sleeping well. Some of us are woken by children, pets or traffic noise during the night. These “<a href="https://www.tandfonline.com/doi/full/10.1080/07420528.2021.2003375">forced awakenings</a>” mean we may find it harder to get up in the morning, take longer to leave bed and feel less satisfied with our sleep. For some people, night awakenings may have no clear cause. A good way to tell if these awakenings are a problem for you is by thinking about how they affect you. When they cause feelings of frustration or worry, or are impacting how we feel and function during the day, it might be a sign to seek some help. We also may struggle to get up in the morning. This could be for a range of reasons, including not sleeping long enough, going to bed or waking up at irregular times – or even your own <a href="https://www.sleephealthfoundation.org.au/sleep-categories/circadian-rhythm-disorders#:%7E:text=The%20circadian%20rhythms%20throughout%20the,regulation%20of%20our%20sleeping%20patterns">internal clock</a>, which can influence the time your body prefers to sleep. If you’re regularly struggling to get up for work or family needs, it can be an indication you may need to seek help. Some of these factors can be explored with a sleep psychologist if they are causing concern. <h2>Can my smart watch help?</h2> It is important to remember sleep-tracking devices can <a href="https://www.nature.com/articles/s41746-024-01016-9">vary in accuracy</a> for looking at the different sleep stages. While they can give a rough estimate, they are not a perfect measure. In-laboratory <a href="https://pubmed.ncbi.nlm.nih.gov/31277862/">polysomnography</a>, or PSG, is the best standard measure to examine your sleep stages. A PSG examines breathing, oxygen saturation, brain waves and heart rate during sleep. Rather than closely examining nightly data (including sleep stages) from a sleep tracker, it may be more helpful to look at the patterns of your sleep (bed and wake times) over time. <a href="https://jcsm.aasm.org/doi/10.5664/jcsm.8356">Understanding your sleep patterns</a> may help identify and adjust behaviours that negatively impact your sleep, such as your bedtime routine and sleeping environment. And if you find viewing your sleep data is making you feel worried about your sleep, this may not be useful for you. Most importantly, if you are concerned it is important to discuss it with your GP who can refer you to the appropriate specialist sleep health provider.<img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/238069/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /> <a href="https://theconversation.com/profiles/amy-reynolds-424346">Amy Reynolds</a>, Associate Professor in Clinical Sleep Health, <a href="https://theconversation.com/institutions/flinders-university-972">Flinders University</a>; <a href="https://theconversation.com/profiles/claire-dunbar-1651340">Claire Dunbar</a>, Research Associate, Sleep Health, <a href="https://theconversation.com/institutions/flinders-university-972">Flinders University</a>; <a href="https://theconversation.com/profiles/gorica-micic-187159">Gorica Micic</a>, Postdoctoral Research Fellow, Clinical Psychologist, <a href="https://theconversation.com/institutions/flinders-university-972">Flinders University</a>; <a href="https://theconversation.com/profiles/hannah-scott-424633">Hannah Scott</a>, Research Fellow in Sleep Health, <a href="https://theconversation.com/institutions/flinders-university-972">Flinders University</a>, and <a href="https://theconversation.com/profiles/nicole-lovato-60684">Nicole Lovato</a>, Associate Professor, Adelaide Institute for Sleep Health, <a href="https://theconversation.com/institutions/flinders-university-972">Flinders University</a> Image credits: Shutterstock This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/an-unbroken-nights-sleep-is-a-myth-heres-what-good-sleep-looks-like-238069">original article</a>.

Body

Lost touch with someone? Reach out – your friend will likely appreciate it more than you think

<a href="https://theconversation.com/profiles/peggy-liu-818769">Peggy Liu</a>, <a href="https://theconversation.com/institutions/university-of-pittsburgh-854">University of Pittsburgh</a> and <a href="https://theconversation.com/profiles/lauren-min-1354136">Lauren Min</a>, <a href="https://theconversation.com/institutions/university-of-kansas-1588">University of Kansas</a> <h2>The big idea</h2> The next time you wonder whether to reach out to a friend, family member, classmate or other person who’s been out of touch for a long time, go ahead and do it. According to <a href="https://doi.org/10.1037/pspi0000402">our just-published research</a>, it’s likely they’ll appreciate it more than you think. In a series of 13 experiments involving over 5,900 participants, we – along with colleagues <a href="https://scholar.google.com/citations?user=0Stzf1cAAAAJ&hl=en">SoYon Rim</a> and <a href="https://scholar.google.com/citations?user=TZQefJAAAAAJ&hl=en">Kate Min</a> – wanted to investigate whether people accurately predict <a href="https://doi.org/10.1037/pspi0000402">how much their social contacts appreciate being reached out to</a>. In one experiment we conducted, college students wrote a note “to check in and say hello” to a classmate they hadn’t interacted with in a while. Then we asked them how much they thought their classmate would appreciate receiving this note. Next, we delivered these notes to their classmates and asked the recipients how much they appreciated receiving them. We found that the students who received the notes were much more appreciative of the gesture than the students who wrote them had anticipated. Other experiments varied the scenario by involving older adults as participants rather than college students, switching the written message to a small gift – such as cookies or coffee – and comparing how much the sender underestimated the appreciation that an emotionally distant contact would feel compared with a close contact. Overall they yielded the same basic finding: People tended to underestimate how much others appreciated hearing from them. What drives this underestimation? Our results suggest that it’s related to how little the people reaching out factor in the surprise felt by those being contacted. When we asked recipients what they focused on when indicating how appreciative they felt, they reported paying a lot of attention to their positive feelings of surprise, which were linked to how appreciative they felt. Comparatively, potential senders did not report focusing much on recipients’ positive feelings of surprise. It also mattered whether the two parties were already in a close relationship. People’s underestimations were even greater when their contact was a distant acquaintance because these recipients were especially surprised at being contacted. <h2>Why it matters</h2> Many people can name at least one person with whom they would like to reconnect. Taking a new job, moving to a different city, becoming a parent, or the busyness of everyday life – these are just some of the life events and circumstances that can cause people to lose touch. Then, if the desire to reconnect arises on one side, doubts may arise about whether the other person may appreciate being contacted out of the blue. When people consider taking the initiative to reach out, especially after a prolonged period of no contact, they may worry about being rejected. This worry might keep them from reaching out in the first place. Our research lessens this challenge by showing that often, these gestures will be much more appreciated than one might expect. <h2>What other research is being done</h2> Our findings fit within a growing stream of research examining the tendency to underestimate others’ appreciation of various social exchanges. For example, other researchers have found that people underestimate how much <a href="https://doi.org/10.1037/pspa0000277">others appreciate receiving compliments</a> or <a href="https://doi.org/10.1177/0956797618772506">expressions of gratitude</a>. Our work adds to this area by broadening the scope of the contexts in which people underestimate how much social exchanges are appreciated. Reaching out could but need not require giving compliments or expressing gratitude – the gesture can be as simple as checking in with someone to show that one is thinking about them.<img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/185001/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /> <a href="https://theconversation.com/profiles/peggy-liu-818769">Peggy Liu</a>, Ben L. Fryrear Chair in Marketing and Associate Professor of Business Administration, <a href="https://theconversation.com/institutions/university-of-pittsburgh-854">University of Pittsburgh</a> and <a href="https://theconversation.com/profiles/lauren-min-1354136">Lauren Min</a>, Assistant Professor of Marketing, <a href="https://theconversation.com/institutions/university-of-kansas-1588">University of Kansas</a> Image credits: Shutterstock This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/lost-touch-with-someone-reach-out-your-friend-will-likely-appreciate-it-more-than-you-think-185001">original article</a>.

Relationships

New study finds epilepsy drug could reduce sleep apnoea symptoms

New research has found that a drug used for epilepsy could be used to reduce the symptoms of sleep apnoea. Obstructive sleep apnoea, which affects about one in 20 people, according to the National Institute for Health and Care Excellence in England, includes symptoms like snoring and it causes a person's breathing to start and stop during the night, with many requiring an aid to help keep their airways open. An international study has identified that taking sulthiame, a drug sold under the brand name Ospolot in Europe, may help prevent patients' breathing from temporarily stopping. This provides an additional option for those unable to use mechanical breathing aids like the Cpap machines. “The standard treatment for obstructive sleep apnoea is sleeping with a machine that blows air through a face mask to keep the airways open. Unfortunately, many people find these machines hard to use over the long term, so there is a need to find alternative treatments,” Prof Jan Hedner from Sahlgrenska university hospital and the University of Gothenburg in Sweden said. Researchers conducted a randomised controlled trial of almost 300 obstructive sleep apnoea patients across Europe, who did not use Cpap machines. They were divided into four groups and given either a placebo or different strengths of sulthiame. The study measured patients’ breathing, oxygen levels, heart rhythm, eye movements, as well as brain and muscle activity while asleep. It found after 12 weeks, those taking sulthiame had up to 50% fewer occasions where their breathing stopped, and higher levels of oxygen in their blood. However, a bigger study needs to be done to confirm the beneficial effects on a larger group. The findings, were presented at the European Respiratory Society Congress in Vienna, Austria. Erika Radford, the head of health advice at Asthma + Lung UK said the findings were a positive step forward in moving away from having to rely on mechanical breathing equipment. “This potential alternative to the current main treatment would make it easier for people to manage their condition,” she said. Image: Shutterstock

Body

Passenger sparks debate over travellers sleeping in aisle seats

A heated debate has erupted online after a passenger suggested those sitting in an aisle seat should remain alert and awake for the entire flight, with the only exception being if it's a long-flight of seven hours or more. “A person sitting in an aisle seat on a plane should not be allowed to sleep," they wrote on Reddit. The reason behind it, according to the passenger, is to ensure that middle and window seat passengers can access the toilet, get served by flight attendants, and evacuate quickly in an emergency. “There are some exceptions and those would probably be on any flight longer than seven hours. “But anything shorter than that, you should not be sleeping. What if the middle or window passenger needs the bathroom, or if the flight attendant needs to hand them something – You’ll be in the way.” They added that a snoozing aisle seat passenger could potentially slow down evacuation during an emergency and put everyone at risk. “Now you would be risking people’s lives because you fell asleep,” they wrote. Social media users flocked to the Reddit thread to share their thoughts. “Nah, just poke me and wake me up if you need me to get up or do something," one wrote. “I’m well aware that I’m in the way, believe me. I’m certainly not there because I wanted to be in the aisle seat.” “If you sleep in an aisle seat, you deal with people getting up. That’s the unwritten rule," another added. A few others supported the idea, but shared their own take on plane etiquette. “My take on this: if you sleep in the aisle seat, you must be okay with being woken up multiple times to let the folks in your row get up. “Other flight rules: middle seat gets the armrest, and window seat must raise the window shade during taxi, takeoff, and landing so the rest of us in the row can watch.” Image: Shutterstock

Travel Tips

Gold medallist sleeps in Paris park to protest "disappointing" Olympic village conditions

A gold medallist has been spotted sleeping in a Paris park in protest of the conditions in the Olympic village. Italian swimmer Thomas Ceccon was captured sleeping atop a white towel in a park located inside the Olympic village by Saudi rower Husein Alireza. Alireza posted the photo to Instagram with the caption, "Rest today, conquer tomorrow." The Italian swimmer, who won gold in the 100m backstroke, had already complained publicly about the accommodations in the Olympic Village, after he failed to reach the 200m backstroke final on Wednesday. Since the commencement of the Paris Games, many athletes have spoken out about the conditions in the Olympic village, saying the beds are uncomfortable, the rooms are poorly air conditioned and the food is poor quality. “There is no air-conditioning in the village, it’s hot, the food is bad,” Ceccon said, according to <a href="https://www.thesun.co.uk/sport/29673636/thomas-ceccon-sleeping-park-conditions-olympic-village-paris/" target="_blank" rel="noopener">The Sun. </a> “Many athletes move for this reason: it’s not an alibi or an excuse, it’s the reality of what perhaps not everybody knows." “I’m disappointed that I didn’t make the final, but I was too tired. It’s hard to sleep both at night and in the afternoon. Here, I really struggle between the heat and the noise.” Andy Anson, the chief of the British Olympic Association, also voiced concerns about how the quality of the village is affecting athletes, telling The Times of London, “There are not enough of certain foods: eggs, chicken, certain carbohydrates.” “And then there is the quality of the food, with raw meat being served to athletes.” A number of athletes, including the entire US women’s tennis team (with the exception of Coco Gauff) have left the village and searched for alternate accommodation for the duration of the Games. Image credits: Instagram/Panoramic/SIPA/SIPA/Shutterstock Editorial

Travel Trouble

Poor sleep is really bad for your health. But we found exercise can offset some of these harms

<div class="theconversation-article-body"><a href="https://theconversation.com/profiles/bo-huei-huang-1243280">Bo-Huei Huang</a>, <a href="https://theconversation.com/institutions/university-of-sydney-841">University of Sydney</a> and <a href="https://theconversation.com/profiles/emmanuel-stamatakis-161783">Emmanuel Stamatakis</a>, <a href="https://theconversation.com/institutions/university-of-sydney-841">University of Sydney</a> Despite the well-known links between poor sleep and poorer health, getting enough good quality sleep has become a luxury in modern society. Many of us struggle to improve our sleep, while amid the COVID pandemic and recurring lock-downs, <a href="https://theconversation.com/were-sleeping-more-in-lockdown-but-the-quality-is-worse-155797">our sleep has deteriorated</a>. But <a href="https://doi.org/10.1136/bjsports-2021-104046">our new study</a>, published today in the British Journal of Sports Medicine, bears some encouraging news. We found doing enough physical activity (including exercise such as running or going to the gym) may counter some of the adverse health effects of unhealthy sleep patterns. Let us explain. <h2>Does poor sleep really harm our health?</h2> Unhealthy sleep patterns include: <ul> <li> not sleeping for long enough (less than seven hours per night for adults) </li> <li> sleeping for too long (more than nine hours per night for adults) </li> <li> snoring </li> <li> insomnia </li> <li> being a night owl, also known as “late chronotype”. This is people who naturally feel most awake and motivated in the evening, and are sluggish in the morning. </li> </ul> They are <a href="https://doi.org/10/ggjqrt">all associated</a> with poorer health. Recent research shows poor sleep may: <ul> <li> cause <a href="https://doi.org/10.1038/s41577-019-0190-z">inflammation</a> </li> <li> impair the metabolism of glucose (also known as blood sugar) and reduce the number of calories burned, thereby increasing the risk of <a href="https://theconversation.com/why-sleep-is-so-important-for-losing-weight-145058">obesity</a> </li> <li> increase the risk of <a href="https://doi.org/10/gg6x87">heart disease</a> and <a href="https://doi.org/10/ggnw5h">premature death</a>. </li> </ul> However, very few studies have examined how sleep and physical activity interact and impact our health. We set out to answer the question: if I have poor sleep but I do quite a lot of physical activity, can that offset some of the harms of my poor sleep in the long-term? Or would this not make any difference? <h2>What did we do?</h2> We analysed the information provided by 380,055 middle-aged adults in the UK Biobank study, recruited between 2006 and 2010. Participants reported their level of physical activity and five aspects of their sleep. We grouped people based on their sleep behaviour into healthy, intermediate or poor. We categorised people’s level of physical activity based on <a href="https://bjsm.bmj.com/content/54/24/1451">the World Health Organization (WHO) guidelines</a>. People who met the upper bounds of the guidelines did 300 minutes of moderate intensity physical activity a week, or 150 minutes of vigorous exercise, or a combination of both. Those who met the lower bound did 150 minutes of moderate intensity exercise a week, or 75 minutes of vigorous exercise, or a combination. Moderate intensity physical activity usually makes you slightly out of breath if sustained for a few minutes and includes brisk walking or cycling at a leisurely pace. Vigorous exercise usually makes you breath hard and can include running, swimming, and playing sports like tennis, netball, soccer or footy. <figure class="align-center "><img src="https://images.theconversation.com/files/408096/original/file-20210624-15-1qfe1ay.png?ixlib=rb-4.1.0&q=45&auto=format&w=754&fit=clip" sizes="(min-width: 1466px) 754px, (max-width: 599px) 100vw, (min-width: 600px) 600px, 237px" srcset="https://images.theconversation.com/files/408096/original/file-20210624-15-1qfe1ay.png?ixlib=rb-4.1.0&q=45&auto=format&w=600&h=409&fit=crop&dpr=1 600w, https://images.theconversation.com/files/408096/original/file-20210624-15-1qfe1ay.png?ixlib=rb-4.1.0&q=30&auto=format&w=600&h=409&fit=crop&dpr=2 1200w, https://images.theconversation.com/files/408096/original/file-20210624-15-1qfe1ay.png?ixlib=rb-4.1.0&q=15&auto=format&w=600&h=409&fit=crop&dpr=3 1800w, https://images.theconversation.com/files/408096/original/file-20210624-15-1qfe1ay.png?ixlib=rb-4.1.0&q=45&auto=format&w=754&h=515&fit=crop&dpr=1 754w, https://images.theconversation.com/files/408096/original/file-20210624-15-1qfe1ay.png?ixlib=rb-4.1.0&q=30&auto=format&w=754&h=515&fit=crop&dpr=2 1508w, https://images.theconversation.com/files/408096/original/file-20210624-15-1qfe1ay.png?ixlib=rb-4.1.0&q=15&auto=format&w=754&h=515&fit=crop&dpr=3 2262w" alt="" /><figcaption>Doing at least 150 minutes of moderate intensity physical activity a week, or 75 minutes of vigorous exercise, can offset some of the health harms of poor sleep. <a class="source" href="https://apps.who.int/iris/bitstream/handle/10665/336656/9789240015128-eng.pdf?sequence=1&isAllowed=y">World Health Organization, CC BY-NC-SA 3.0 IGO</a></figcaption></figure> <h2>What did we find?</h2> We followed up with the participants after 11 years. By May 2020, 15,503 participants had died, of which 4,095 died from heart disease and 9,064 died from cancer. <a href="https://doi.org/10.1136/bjsports-2021-104046">We found</a> that, compared to healthy sleepers, people with poor sleep had a 23% higher risk of premature death, a 39% higher risk of dying from heart disease, and a 13% higher risk of dying from cancer. We then compared the data of people who slept well with those who slept poorly, and how much they exercised. We found people who had the highest risk of dying from heart disease and cancer were those who had poor sleep and didn’t meet the WHO physical activity guidelines. On the other hand, those who had poor sleep but did enough physical activity to meet the WHO guidelines didn’t have as high a risk of dying from heart disease or cancer, compared to those who slept poorly and didn’t meet the physical activity guidelines. For example, let’s look at the risk of dying from cancer. Those who had poor sleep and did no physical activity had a 45% higher risk of dying from cancer compared to those who had healthy sleep and exercised a lot. But among those who met the physical activity guidelines, despite poor sleep, they didn’t really have a higher risk of dying from cancer any more. We found physical activity levels which met at least the bottom threshold of the WHO guidelines could reduce or eliminate some of the health harms of poor sleep. So people who did at least 150 minutes of moderate intensity or 75 minutes of vigorous intensity exercise per week were to some extent protected against the detrimental health effects of poor sleep. Those who had both poor sleep and did no moderate-to-vigorous intensity physical activity had the highest risks of premature death. Our study wasn’t designed to find out how and why physical activity may counteract some of the bad physiological impacts of poor sleep. But other research provides theories. For example, adequate physical activity may <a href="https://doi.org/10.1249/MSS.0000000000001179">reduce inflammation, help maintain a healthy glucose metabolism</a>, and <a href="https://doi.org/10.1016/j.pcad.2018.07.014">increase the number of calories burned</a>. It’s important to note our study was what’s called an “observational study”. It shows an association between adequate physical activity and reduced harms from poor sleep, but we must be careful in interpreting causation. It can’t conclusively say adequate physical activity causes the reduction of harms from poor sleep, though there’s strong evidence for an association in the right direction. Our study offers a hopeful message, that even if you haven’t been able to improve your sleep, you can still offset some of the health harms by doing enough exercise. <a href="https://www.sciencedirect.com/science/article/abs/pii/S009174352030339X">Our previous research</a> has also shown physical activity may help improve poor sleep patterns, which are a serious health problem across the world. In addition to combating some of the negative outcomes of poor sleep, physical activity can also provide many other health benefits and extend our lives. For example, a 2019 study found people who met WHO’s physical activity target above <a href="https://doi.org/10.1186/s12916-019-1339-0">lived three years longer on average</a> than those who didn’t. During lockdowns, access to parks, gyms, and swimming pools might be limited in many places. But there are still many ways to <a href="https://www.euro.who.int/en/health-topics/health-emergencies/coronavirus-covid-19/publications-and-technical-guidance/noncommunicable-diseases/stay-physically-active-during-self-quarantine">to stay fit and active at home during the coronavirus</a>.<img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/163270/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /> <a href="https://theconversation.com/profiles/bo-huei-huang-1243280">Bo-Huei Huang</a>, PhD candidate, <a href="https://theconversation.com/institutions/university-of-sydney-841">University of Sydney</a> and <a href="https://theconversation.com/profiles/emmanuel-stamatakis-161783">Emmanuel Stamatakis</a>, Professor of Physical Activity, Lifestyle, and Population Health, <a href="https://theconversation.com/institutions/university-of-sydney-841">University of Sydney</a> Image credits: Shutterstock This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/poor-sleep-is-really-bad-for-your-health-but-we-found-exercise-can-offset-some-of-these-harms-163270">original article</a>. </div>

Body

Want to sleep longer? Adding mini-bursts of exercise to your evening routine can help

<a href="https://theconversation.com/profiles/jennifer-gale-1548741">Jennifer Gale</a>, <a href="https://theconversation.com/institutions/university-of-otago-1304">University of Otago</a> and <a href="https://theconversation.com/profiles/meredith-peddie-1548807">Meredith Peddie</a>, <a href="https://theconversation.com/institutions/university-of-otago-1304">University of Otago</a> Exercising before bed has <a href="https://www.sciencedirect.com/science/article/pii/S2352721815000157">long been discouraged</a> as the body doesn’t have time to wind down before the lights go out. But <a href="https://bmjopensem.bmj.com/content/10/3/e001774">new research</a> has found breaking up a quiet, sedentary evening of watching television with short bursts of resistance exercise can lead to longer periods of sleep. Adults spend almost one third of the 24-hour day sleeping. But the quality and length of sleep can affect long-term health. Sleeping too little or waking often in the night is associated with an <a href="https://academic.oup.com/sleep/article-lookup/doi/10.5665/sleep.1382">increased risk of heart disease</a> and <a href="https://diabetesjournals.org/care/article/33/2/414/27149/Quantity-and-Quality-of-Sleep-and-Incidence-of">diabetes</a>. Physical activity during the day can help improve sleep. However, <a href="https://www.sciencedirect.com/science/article/pii/S2352721815000157">current recommendations</a> discourage intense exercise before going to bed as it can increase a person’s heart rate and core temperature, which can ultimately disrupt sleep. <h2>Nighttime habits</h2> For many, the longest period of uninterrupted sitting happens at home in the evening. People also usually consume their largest meal during this time (or snack throughout the evening). Insulin (the hormone that helps to remove sugar from the blood stream) tends to be at a lower level in the evening than in the morning. Together these factors promote elevated blood sugar levels, which over the long term can be bad for a person’s health. Our <a href="https://journals.lww.com/acsm-msse/fulltext/2023/08000/breaking_up_evening_sitting_with_resistance.14.aspx">previous research</a> found interrupting evening sitting every 30 minutes with three minutes of resistance exercise reduces the amount of sugar in the bloodstream after eating a meal. But because sleep guidelines currently discourage exercising in the hours before going to sleep, we wanted to know if frequently performing these short bursts of light activity in the evening would affect sleep. <h2>Activity breaks for better sleep</h2> In our latest research, we asked 30 adults to complete two sessions based in a laboratory. During one session the adults sat continuously for a four-hour period while watching streaming services. During the other session, they interrupted sitting by performing three minutes of body-weight resistance exercises (squats, calf raises and hip extensions) every 30 minutes. After these sessions, participants went home to their normal life routines. Their sleep that evening was measured using a wrist monitor. Our research found the quality of sleep (measured by how many times they woke in the night and the length of these awakenings) was the same after the two sessions. But the night after the participants did the exercise “activity breaks” they slept for almost 30 minutes longer. Identifying the biological reasons for the extended sleep in our study requires further research. But regardless of the reason, if activity breaks can extend sleep duration, then getting up and moving at regular intervals in the evening is likely to have clear health benefits. <h2>Time to revisit guidelines</h2> These results add to <a href="https://linkinghub.elsevier.com/retrieve/pii/S1087079221001209">earlier work</a> suggesting current sleep guidelines, which discourage evening exercise before bed, may need to be reviewed. As the activity breaks were performed in a highly controlled laboratory environment, future research should explore how activity breaks performed in real life affect peoples sleep. We selected simple, body-weight exercises to use in this study as they don’t require people to interrupt the show they may be watching, and don’t require a large space or equipment. If people wanted to incorporate activity breaks in their own evening routines, they could probably get the same benefit from other types of exercise. For example, marching on the spot, walking up and down stairs, or even dancing in the living room. The key is to frequently interrupt evening sitting time, with a little bit of whole-body movement at regular intervals. In the long run, performing activity breaks may improve health by improving sleep and post-meal blood sugar levels. The most important thing is to get up frequently and move the body, in a way the works best for a person’s individual household.<img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/234896/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /> <a href="https://theconversation.com/profiles/jennifer-gale-1548741">Jennifer Gale</a>, PhD candidate, Department of Human Nutrition, <a href="https://theconversation.com/institutions/university-of-otago-1304">University of Otago</a> and <a href="https://theconversation.com/profiles/meredith-peddie-1548807">Meredith Peddie</a>, Senior Lecturer, Department of Human Nutrition, <a href="https://theconversation.com/institutions/university-of-otago-1304">University of Otago</a> Image credits: Shutterstock This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/want-to-sleep-longer-adding-mini-bursts-of-exercise-to-your-evening-routine-can-help-new-study-234896">original article</a>.

Body

Why can’t I sleep? It could be your sheets or doona

<div class="theconversation-article-body"> <a href="https://theconversation.com/profiles/chin-moi-chow-169404">Chin Moi Chow</a>, <a href="https://theconversation.com/institutions/university-of-sydney-841">University of Sydney</a>; <a href="https://theconversation.com/profiles/cynthia-xinzhu-li-1532937">Cynthia (Xinzhu) Li</a>, <a href="https://theconversation.com/institutions/university-of-sydney-841">University of Sydney</a>, and <a href="https://theconversation.com/profiles/mark-halaki-1532934">Mark Halaki</a>, <a href="https://theconversation.com/institutions/university-of-sydney-841">University of Sydney</a> It’s winter, so many of us will be bringing out, or buying, winter bedding. But how much of a difference does your bedding make to your thermal comfort? Can a particular textile help you sleep? Is it wool, or other natural fibres, such as cotton? How about polyester? With so much choice, it’s easy to be confused. Here’s what we <a href="https://onlinelibrary.wiley.com/doi/full/10.1111/jsr.14217">found</a> when we reviewed the evidence – not just for winter, but also for the summer ahead. <h2>The importance of bedding</h2> We <a href="https://doi.org/10.1016/j.enbuild.2020.110097">rely on our bedding</a> to maintain a comfortable temperature to help us sleep. And the <a href="https://www.sciencedirect.com/science/article/abs/pii/S0378778817317681">right textiles</a> can help regulate our body temperature and <a href="https://onlinelibrary.wiley.com/doi/abs/10.1002/9783527342587.ch31">wick away moisture</a> from sweat, promoting better sleep. In the cooler months, we’re mainly concerned about a textile’s insulation properties – keeping body heat in and the cold out. As the temperature climbs, we’re less concerned about insulation and more concerned about wicking away moisture from sweat. Another factor to consider is a textile’s breathability – how well it allows air to pass through it. A breathable textile helps keep you cool, by allowing warmth from your body to escape. It also helps keep you comfortable by preventing build-up of moisture. By releasing excess heat and moisture, a breathable textile makes it feel cooler and more comfortable against the skin. <h2>Different textiles have different properties</h2> Some textiles are better than others when it comes to insulation, wicking away moisture or breathability. For instance, cotton and wool have tiny air pockets that <a href="https://nopr.niscair.res.in/bitstream/123456789/24505/1/IJFTR%2031(1)%20177-186.pdf">act as insulation</a> to provide <a href="https://www.sciencedirect.com/science/article/abs/pii/0379711281900072">warmth</a> in cold weather. Thicker fabrics with more air pockets tend to be warmer, softer and more breathable. But these factors are also affected by the type of fibre, the weave of the fabric and the manufacturing process. Cotton and wool are also breathable fabrics, meaning they help regulate temperature. <hr /> <iframe id="CqVe0" class="tc-infographic-datawrapper" style="border: none;" src="https://datawrapper.dwcdn.net/CqVe0/" width="100%" height="400px" frameborder="0"></iframe> <hr /> While cotton absorbs moisture (sweat) from your skin, it doesn’t wick it away efficiently. This retained moisture can make cotton feel clingy and uncomfortable, potentially leading to chills in warm weather. But wool is <a href="https://onlinelibrary.wiley.com/doi/full/10.1111/jsr.14217">highly absorbent</a> and wicks moisture effectively. In warmer weather, when we sweat, wool fibres allow for airflow and moisture transfer, promoting efficient sweat evaporation and cooling, and preventing overheating. So wool (in different thicknesses) can be a good option in both summer and winter. Linen, although breathable and having moisture-wicking properties, provides less insulation than wool and cotton due to its hollow fibres. This makes linen less effective for keeping warm in winter but is effective for keeping cool in summer. Polyester is a synthetic fibre that can be made to trap air for insulation, but it is not naturally breathable. Usually, it absorbs moisture poorly. So it can trap sweat next to the skin, causing discomfort. However, polyester can be specially treated to help control moisture from sweat. <h2>Which sheets help you sleep?</h2> As part of our review, we couldn’t find any studies that directly compared sheets made from different textiles (for instance, regular cotton and flannelette) and their impact on sleep when it’s cold. However, linen sheets are particularly effective in warmer conditions. In one study, conducted at 29°C and high humidity, linen sheets <a href="https://openurl.ebsco.com/EPDB%3Agcd%3A10%3A26460954/detailv2?sid=ebsco%3Aplink%3Ascholar&id=ebsco%3Agcd%3A87732897&crl=c">promoted</a> less wakefulness and fewer stages of light sleep than cotton sheets. <h2>How about doonas?</h2> If you don’t heat your bedroom at night in winter, a goose down doona (one made from fine, goose feathers) might be an option. These promoted the <a href="https://www.sciencedirect.com/science/article/abs/pii/S0378778818321728">longest, deep-sleep</a>, followed by duck down, then cotton when sleeping at 11°C. This may be because down offers better insulation (by trapping more air) than cotton. Down also has lower thermal conductivity than cotton, meaning it’s better at keeping warmth in. Choosing between a wool or polyester doona? In a wool-industry funded <a href="https://www.tandfonline.com/doi/full/10.2147/NSS.S100271">study</a> two of us (Chow and Halaki) co-authored, there wasn’t much difference. The study in young adults found no significant difference on sleep at 17°C or 22°C. <h2>So how do I choose?</h2> The choice of bedding is highly individual. What feels comfortable to one person is not the same for the next. That’s because of variations in body size and metabolic rate, local climate, bedroom temperature and building insulation. These can also affect sleep. This variability, and a wide range of study designs, also makes it hard to compare different studies about the impact of different textiles on sleep. So you might need to experiment with different textiles to discover what works for you. <hr /> Many factors can affect your sleep, not just your bedding. So if you’re having trouble sleeping, you can find more information from the <a href="https://www.sleephealthfoundation.org.au/">Sleep Health Foundation</a>. If symptoms continue, see your GP.<img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/229604/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /> <a href="https://theconversation.com/profiles/chin-moi-chow-169404">Chin Moi Chow</a>, Associate Professor of Sleep and Wellbeing, <a href="https://theconversation.com/institutions/university-of-sydney-841">University of Sydney</a>; <a href="https://theconversation.com/profiles/cynthia-xinzhu-li-1532937">Cynthia (Xinzhu) Li</a>, PhD candidate studying menopause and sleep, <a href="https://theconversation.com/institutions/university-of-sydney-841">University of Sydney</a>, and <a href="https://theconversation.com/profiles/mark-halaki-1532934">Mark Halaki</a>, Professor of Human Movement, <a href="https://theconversation.com/institutions/university-of-sydney-841">University of Sydney</a> Image credits: Shutterstock This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/why-cant-i-sleep-it-could-be-your-sheets-or-doona-229604">original article</a>. </div>

Body

‘Sleep tourism’ promises the trip of your dreams. Beyond the hype plus 5 tips for a holiday at home

<a href="https://theconversation.com/profiles/charlotte-gupta-347235">Charlotte Gupta</a>, <a href="https://theconversation.com/institutions/cquniversity-australia-2140">CQUniversity Australia</a> and <a href="https://theconversation.com/profiles/dean-j-miller-808724">Dean J. Miller</a>, <a href="https://theconversation.com/institutions/cquniversity-australia-2140">CQUniversity Australia</a> Imagine arriving at your hotel after a long flight and being greeted by your own personal sleep butler. They present you with a pillow menu and invite you to a sleep meditation session later that day. You unpack in a room kitted with an AI-powered smart bed, blackout shades, blue light-blocking glasses and weighted blankets. Holidays are traditionally for activities or sightseeing – eating Parisian pastry under the Eiffel tower, ice skating at New York City’s Rockefeller Centre, lying by the pool in Bali or sipping limoncello in Sicily. But “<a href="https://www.smh.com.au/traveller/inspiration/pillow-menus-and-sleep-gummies-the-new-hotel-trend-that-s-putting-guests-to-sleep-20230823-p5dyu5.html">sleep tourism</a>” offers vacations for the sole purpose of getting good sleep. The emerging trend extends out of the global wellness tourism industry – reportedly worth more than <a href="https://www.forbes.com/sites/rogersands/2023/11/17/the-global-wellness-tourism-sector-surpasses-814-billion-market-share/">US$800 billion globally</a> (A$1.2 trillion) and <a href="https://www.statista.com/statistics/1018497/global-market-size-of-the-wellness-tourism-industry/">expected to boom</a>. Luxurious sleep retreats and sleep suites at hotels are popping up <a href="https://www.countryandtownhouse.com/style/health-and-beauty/sleep-retreats/">all over the world</a> for tourists to get some much-needed rest, relaxation and recovery. But do you really need to leave home for some shuteye? <h2>Not getting enough</h2> The rise of sleep tourism may be a sign of just how chronically sleep deprived we all are. In Australia more than one-third of adults are not achieving the recommended <a href="https://www.sciencedirect.com/science/article/pii/S2352721816301292?via%3Dihub">7–9 hours</a> of sleep per night, and the estimated cost of this inadequate sleep is <a href="https://academic.oup.com/sleep/article/41/8/zsy083/5025924">A$45 billion</a> each year. Inadequate sleep is linked to <a href="https://www.tandfonline.com/doi/full/10.2147/NSS.S134864">long-term health problems</a> including poor mental health, heart disease, metabolic disease and deaths from any cause. <h2>Can a fancy hotel give you a better sleep?</h2> Many of the sleep services available in the sleep tourism industry aim to optimise the bedroom for sleep. This is a core component of <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4400203/?ref=askdoctorjad.com">sleep hygiene</a> – a series of healthy sleep practices that facilitate good sleep including sleeping in a comfortable bedroom with a good mattress and pillow, sleeping in a quiet environment and relaxing before bed. The more people follow sleep hygiene practices, the better their <a href="https://www.tandfonline.com/doi/abs/10.1080/08964280209596396">sleep quality and quantity</a>. When we are staying in a hotel we are also likely away from any stressors we encounter in everyday life (such as work pressure or caring responsibilities). And we’re away from potential nighttime disruptions to sleep we might experience at home (the construction work next door, restless pets, unsettled children). So regardless of the sleep features hotels offer, it is likely we will experience improved sleep when we are away. <h2>What the science says about catching up on sleep</h2> In the short-term, <a href="https://theconversation.com/is-it-possible-to-catch-up-on-sleep-we-asked-five-experts-98699#:%7E:text=We%20can%20catch%20up%20on,and%20we%20cannot%20resist%20sleep.">we can catch up on sleep</a>. This can happen, for example, after a short night of sleep when our brain accumulates “<a href="https://www.tandfonline.com/doi/abs/10.3109/07420528.2012.675256">sleep pressure</a>”. This term describes how strong the biological drive for sleep is. More sleep pressure makes it easier to sleep the next night and to sleep for longer. But while a longer sleep the next night can relieve the sleep pressure, it does not reverse the <a href="https://jcsm.aasm.org/doi/pdf/10.5664/jcsm.26918">effects of the short sleep on our brain and body</a>. Every night’s sleep is important for our body to recover and for our brain to process the events of that day. Spending a holiday “catching up” on sleep could help you feel more rested, but it is not a substitute for prioritising regular healthy sleep at home. All good things, including holidays, must come to an end. Unfortunately the perks of sleep tourism may end too. Our bodies do not like variability in the time of day that we sleep. The most common example of this is called “<a href="https://www.mdpi.com/2072-6643/13/12/4543">social jet lag</a>”, where weekday sleep (getting up early to get to work or school) is vastly different to weekend sleep (late nights and sleep ins). This can result in a sleepy, grouchy start to the week on Monday. Sleep tourism may be similar, if you do not come back home with the intention to prioritise sleep. So we should be mindful that as well as sleeping well on holiday, it is important to optimise conditions at home to get consistent, adequate sleep every night. <h2>5 tips for having a sleep holiday at home</h2> An AI-powered mattress and a sleep butler at home might be the dream. But these features are not the only way we can optimise our sleep environment and give ourselves the best chance to get a good night’s sleep. Here are five ideas to start the night right: 1. avoid bright artificial light in the evening (such as bright overhead lights, phones, laptops) 2. make your bed as comfortable as possible with fresh pillows and a supportive mattress 3. use black-out window coverings and maintain a cool room temperature for the ideal sleeping environment 4. establish an evening wind-down routine, such as a warm shower and reading a book before bed or even a “<a href="https://theconversation.com/turns-out-the-viral-sleepy-girl-mocktail-is-backed-by-science-should-you-try-it-222151">sleepy girl mocktail</a>” 5. use consistency as the key to a good sleep routine. Aim for a similar bedtime and wake time – even on weekends.<img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/231718/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /> <a href="https://theconversation.com/profiles/charlotte-gupta-347235">Charlotte Gupta</a>, Senior postdoctoral research fellow, Appleton Institute, HealthWise research group, <a href="https://theconversation.com/institutions/cquniversity-australia-2140">CQUniversity Australia</a> and <a href="https://theconversation.com/profiles/dean-j-miller-808724">Dean J. Miller</a>, Adjunct Research Fellow, Appleton Institute of Behavioural Science, <a href="https://theconversation.com/institutions/cquniversity-australia-2140">CQUniversity Australia</a> Image credits: Shutterstock This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/sleep-tourism-promises-the-trip-of-your-dreams-beyond-the-hype-plus-5-tips-for-a-holiday-at-home-231718">original article</a>.

Travel Trouble

‘Sleeping on it’ really does help and four other recent sleep research breakthroughs

<a href="https://theconversation.com/profiles/dan-denis-158199">Dan Denis</a>, <a href="https://theconversation.com/institutions/university-of-york-1344">University of York</a> Twenty-six years. That is roughly <a href="https://www.nature.com/articles/s41467-022-34624-8">how much of our lives</a> are spent asleep. Scientists have been trying to explain why we spend so much time sleeping since at least the <a href="https://plato.stanford.edu/entries/alcmaeon/">ancient Greeks</a>, but pinning down the exact functions of sleep has proven to be difficult. During the past decade, there has been a surge of interest from researchers in the nature and function of sleep. New experimental models coupled with advances in technology and analytical techniques are giving us a deeper look inside the sleeping brain. Here are some of the biggest recent breakthroughs in the science of sleep. <h2>1. We know more about lucid dreaming</h2> No longer on the fringes, the neuroscientific study of dreaming has now become mainstream. US researchers in a 2017 study woke their participants up at regular intervals during the night and asked them what was going through their minds prior to the alarm call. Sometimes participants couldn’t recall any dreaming. The study team then looked at what was <a href="https://www.nature.com/articles/nn.4545">happening in the participant’s brain</a> moments before waking. Participants’ recall of dream content was associated with increased activity in the posterior hot zone, an area of the brain closely <a href="https://www.nature.com/articles/d41586-018-05097-x">linked to conscious awareness</a>. Researchers could predict the presence or absence of dream experiences by monitoring this zone in real time. Another exciting development in the study of dreams is research into lucid dreams, in which <a href="https://theconversation.com/the-ability-to-control-dreams-may-help-us-unravel-the-mystery-of-consciousness-52394">you are aware that</a> you are dreaming. A 2021 study established <a href="https://www.cell.com/current-biology/fulltext/S0960-9822(21)00059-2?_returnURL=https%3A%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS0960982221000592%3Fshowall%3Dtrue">two-way communication</a> between a dreamer and a researcher. In this experiment, participants signalled to the researcher that they were dreaming by moving their eyes in a pre-agreed pattern. The researcher read out maths problems (what is eight minus six?). The dreamer could respond to this question with eye movements. The dreamers were accurate, indicating they had access to high level cognitive functions. The researchers used <a href="https://www.mayoclinic.org/tests-procedures/polysomnography/about/pac-20394877">polysomnography</a>, which monitors bodily functions such as breathing and brain activity during sleep, to confirm that participants were asleep. These discoveries have dream researchers excited about the future of “interactive dreaming”, such as practising a skill or solving a problem in our dreams. <h2>2. Our brain replays memories while we sleep</h2> This year marks the centenary of the first demonstration that <a href="https://www.jstor.org/stable/1414040?origin=crossref">sleep improves our memory</a>. However, a 2023 review of recent research has shown that memories formed during the day <a href="https://portlandpress.com/emergtoplifesci/article/7/5/487/233796/Neural-reactivation-during-human-sleep">get reactivated</a> while we are sleeping. Researchers discovered this using machine learning techniques to “decode” the contents of the sleeping brain. <a href="https://www.nature.com/articles/s41467-021-24357-5">A 2021 study</a> found that training algorithms to distinguish between different memories while awake makes it possible to see the same neural patterns re-emerge in the sleeping brain. A different study, also in 2021, found that the more times these patterns re-emerge during sleep, <a href="https://www.nature.com/articles/s41467-021-23520-2">the bigger the benefit</a> to memory. In other approaches, scientists have been able to reactivate certain memories by <a href="https://www.cell.com/current-biology/fulltext/S0960-9822(19)31035-8?_returnURL=https%3A%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS0960982219310358%3Fshowall%3Dtrue">replaying sounds</a> associated with the memory in question while the participant was asleep. A <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7144680/">2020 meta-analysis of 91 experiments</a> found that when participants’ memory was tested after sleep they remembered more of the stimuli whose sounds were played back during sleep, compared with control stimuli whose sounds were not replayed. Research has also shown that sleep strengthens memory for the <a href="https://www.pnas.org/doi/10.1073/pnas.2202657119">most important aspects</a> of an experience, restructures our memories to form <a href="https://www.jneurosci.org/content/40/9/1909">more cohesive narratives</a> and helps us come up with <a href="https://journals.sagepub.com/doi/10.1177/0956797619873344">solutions to problems</a> we are stuck on. Science is showing that sleeping on it really does help. <h2>3. Sleep keeps our minds healthy</h2> We all know that a lack of sleep makes us feel bad. Laboratory sleep deprivation studies, where researchers keep willing participants awake throughout the night, have been combined with <a href="https://www.open.edu/openlearn/body-mind/health/health-sciences/how-fmri-works">functional MRI brain scans</a> to paint a detailed picture of the sleep-deprived brain. These studies have shown that a lack of sleep severely disrupts the <a href="https://www.nature.com/articles/nrn.2017.55">connectivity between</a> different brain networks. These changes include a breakdown of connectivity between brain regions <a href="https://link.springer.com/article/10.1007/s11682-018-9868-2">responsible for cognitive control</a>, and an amplification of those involved in <a href="https://www.cell.com/current-biology/fulltext/S0960-9822(19)30761-4?_returnURL=https%3A%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS0960982219307614%3Fshowall%3Dtrue">threat and emotional processing</a>. The consequence of this is that the sleep-deprived brain is worse at <a href="https://academic.oup.com/cercor/article/33/5/1610/6573958">learning new information</a>, <a href="https://academic.oup.com/sleep/article/44/6/zsaa289/6053003">poorer at regulating emotions</a>, and unable to <a href="https://journals.sagepub.com/doi/10.1177/2167702620951511">suppress intrusive thoughts</a>. Sleep loss may even make you less likely to <a href="https://journals.plos.org/plosbiology/article?id=10.1371/journal.pbio.3001733">help other people</a>. These findings may explain why poor sleep quality is so <a href="https://onlinelibrary.wiley.com/doi/10.1111/jsr.13930">ubiquitous in poor mental health</a>. <h2>4. Sleep protects us against neurodegenerative diseases</h2> Although we naturally <a href="https://www.nature.com/articles/s41467-022-34624-8">sleep less as we age</a>, mounting evidence suggests that sleep problems earlier in life <a href="https://jnnp.bmj.com/content/91/3/236">increase the risk</a> of dementia. The build-up of β-amyloid, a <a href="https://www.nhs.uk/conditions/alzheimers-disease/causes/">metabolic waste product</a>, is one of the mechanisms underlying Alzheimer’s disease. Recently, it has become apparent that deep, undisturbed sleep is good for <a href="https://www.science.org/doi/10.1126/sciadv.aav5447">flushing these toxins</a> out of the brain. Sleep deprivation increases the the rate of build-up of β-amyloid in parts of the brain involved in memory, <a href="https://www.pnas.org/doi/full/10.1073/pnas.1721694115">such as the hippocampus</a>. A longitudinal study published in 2020 found that sleep problems were associated with a higher rate of β-amyloid accumulation at a follow-up <a href="https://www.cell.com/current-biology/fulltext/S0960-9822(20)31171-4?_returnURL=https%3A%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS0960982220311714%3Fshowall%3Dtrue">four years later</a>. In a different study, published in 2022, sleep parameters <a href="https://elifesciences.org/articles/78191">forecasted the rate</a> of cognitive decline in participants over the following two years. <h2>5. We can engineer sleep</h2> The good news is that research is developing treatments to get a better night’s sleep and boost its benefits. For example, the <a href="https://onlinelibrary.wiley.com/doi/10.1111/jsr.14035">European Sleep Research Society</a> and the <a href="https://jcsm.aasm.org/doi/10.5664/jcsm.8986">American Academy of Sleep Medicine</a> recommend cognitive behavioural therapy for insomnia (CBT-I). <a href="https://www.cntw.nhs.uk/services/nctalkingtherapies/what-do-nc-talking-therapies-offer/cbt-i-cbt-for-insomnia/">CBT-I works by</a> identifying thoughts, feelings and behaviour that contribute to insomnia, which can then be modified to help promote sleep. In 2022, a CBT-I app became the <a href="https://www.nice.org.uk/news/article/nice-recommends-offering-app-based-treatment-for-people-with-insomnia-instead-of-sleeping-pills">first digital therapy</a> recommended by England’s National Institute for Health and Care Excellence for treatment on the NHS. These interventions can improve other aspects of our lives as well. A <a href="https://www.sciencedirect.com/science/article/pii/S1087079221001416?via%3Dihub">2021 meta-analysis</a> of 65 clinical trials found that improving sleep via CBT-I reduced symptoms of depression, anxiety, rumination and stress.<img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/230484/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /> <a href="https://theconversation.com/profiles/dan-denis-158199">Dan Denis</a>, Marie Skłodowska-Curie Senior Research Fellow, <a href="https://theconversation.com/institutions/university-of-york-1344">University of York</a> Image credits: Shutterstock This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/sleeping-on-it-really-does-help-and-four-other-recent-sleep-research-breakthroughs-230484">original article</a>.

Body

5 ways your sleep affects what you eat

We know a good night’s sleep is good for us but logging in those hours of sleep can be a difficult task. Without quality shut-eye, our productivity decreases, immune system weakens and even our dietary health is negatively affected. You eat more when you sleep less A Mayo Clinic study comparing the eating habits of people who slept as much as they needed and those who only slept two-thirds of their required rest time for eight days, found the subject who were sleep-deprived ended up eating an average of 549 extra calories each day. You snack more, especially at night A lack of sleep can lead to decrease in physical activity and an increase in snacking behaviour. Such behaviours typically leads to weight gain. You crave extra carbs and fatty foods The foods we’re snacking on aren’t usually the healthy variety. A 2013 study found that when we’re tired we not only crave unhealthy, -carbohydrate, and high-fat foods but we’re less likely to consider the consequences of such food choices over time. Disrupted sleep cycle equal changing eating patterns Your internal clock guides both your sleep patterns and your eating patterns – aka when you feel hungry during the day. A 2011 study found that people who are “late sleepers” tend to delay their meals throughout the day and end up consuming more calories than the average meal. Those late-eating habits affect sleep and perpetuates the cycle. You don’t eat the right foods A 2013 study found that sleep-deprived subjects ate half the fruit and vegetable servings of a normal sleeper. This meant losing key nutrients from their diet, which can lead to dietary imbalances and effect the regular functioning of the body. Image credits: Shutterstock

Body

10 best airports for sleeping

Sleeping in airports isn’t exactly luxury, but sometimes when you’re stuck between flights you’re all out of options. We’ve taken a look at the 10 best airports to sleep in. While you might not be able to get your full set of 40 winks, at least you can catch a little bit of shut eye at these airports. 10. Taipei Taoyuan International Airport – Taiwan You might want to bring along an eye mask or sunglasses, but you can definitely get a bit of shut-eye between flights at Taipei Taoyuan International Airport. This airport makes the list but it is quite busy so it’s an idea to have some earplugs or even a pillow if you’re serious about sleeping. 9. Stockholm Arlanda International Airport – Sweden Nothing ruins an airport nap like missing your international flight! Travellers sleeping at Stockholm Arlanda International Airport needn’t be concerned though as there have been reports of travellers leaving post-it notes with stickers that say “Wake me at 5:00am”. Beats an alarm clock! 8. Tallinn International Airport – Estonia This international airport is fast gaining a reputation as a good place to catch some sleep, but it’s advised that you make sure you sleep near other travellers. The website says, “Make sure they are actual travellers and not homeless people – it is sometimes hard to tell in certain airports.” 7. Tokyo Haneda International Airport – Japan Due partly to its proximity to the rest of town, Tokyo Haneda International Airport is a very popular airport to sleep at, to the point where the site says, “If you are staying at a busy airport overnight, you'll have to get there early if you want a good spot, especially during the summer season.” 6. Porto Francisco Sá Carneiro Airport – Portugal While this airport provides a great option for travellers looking to catch up on a little bit of shut-eye, they still have to be creative. The website recommends heading, “behind ticket counters, under and behind seats, in wheelchairs and on luggage conveyor belts,” to get some sleep. 5. Vienna International Airport – Austria This airport sports a grand-spanking new terminal with some nice cots for you to catch up with some shut eye in peace and privacy. There are also lots of power sockets around the place if you need to charge devices or even if you were looking to check out the latest <a href="../news/news/">O</a>ver 60 article on your tablet! 4. Munich International Airport – Germany If you’re looking to catch up on some sleep at the home of Oktoberfest you’re in luck – Munich International Airport is set up pretty well for dozing travellers, relatively safe and asides from the odd security officer asking to see your boarding pass you will generally be left alone. 3. Helsinki International Airport – Finland There is a range of options for sleepy travellers at Helsinki International Airport including the famous GoSleep airport sleeping pods. These handy capsules measure in at 1.8 metres by 0.6 metres, and can be rented for as little as $12 to ensure you get some peace and quiet as you sleep. 2. Seoul Incheon International Airport – South Korea This huge international airport is a marvel in and of itself and provides a state of the art, luxurious place to get a little bit of shut eye between naps. What is even better is the fact that there have been reports of, “a few generous vendors giving away their unsold food to airport sleepers.” 1. Changi International Airport – Singapore When you look at the inclusions this airport has sheerly designed to enhance customer comfort you can see why there’s no question Changi International Airport came out at number one. Enjoy massage chairs, low-lit relaxation zones, armrest-free seating and handy charging outlets. Image credits: Shutterstock

Travel Tips

10 tips for a better night’s sleep in a hotel room

From noisy neighbours to unbearable bedding, a good night’s sleep in a hotel room can be hard to come by. Here are 10 tips to help you get decent shut eye. 1. Book a room midway down a hallway This is generally the quietest part of the floor, way from ice and wending machines, laundry facilities, exits, closets and any other places where sudden noises might occur. 2. Try to avoid rooms facing a pool While the view is something to admire, pools can also be the sight of noise generating late-night gathering and any sounds generally echo loudly off the water. 3. Inquire at the front desk about pillow options If the wrong pillow gives you back or neck pain have a chat to the front desk when checking in. Most hotels stock pillows of varying firmness, and can offer a better fit. 4. Pack earplugs and eyeshades When you’re struggling to get to sleep the tiniest noise or ray of light can end up being a huge distraction. Nip this in the bud by packing earplugs and eyeshades. 5. Turn your mobile phone off Mobile notifications can be a huge distraction (particularly when they’re coming from friends and family in different time zones). Turn your phone off, and enjoy the bliss. 6. Make use of your ‘do not disturb’ sign If you’re planning to sleep in make sure you put your ‘do not disturb’ sign on the outside doorknob, otherwise you might get a rude awakening from a housekeeper. 7. Report any noises immediately Sometimes a quick pound of the wall will quiet down a noisy neighbour, but this doesn’t always work. If the people in the room next to you won’t keep quiet, make sure you let the front desk know and they can take the necessary actions. 8. Adjust the room temperature Most people sleep better in a cooler room, so make sure you adjust the temperature to whatever is the best fit for you to get sleep. Even just opening the window a tiny little crack can make a big difference in terms of your overall comfort levels. 9. Ask the front desk about blackout shades Particularly if you’re staying in a city that’s full of lights, noises and distractions, blackout shades can provide you with a level of peace and comfort that will help you sleep. 10. Consider bringing your own sheets Particularly if you’ve got skin sensitives, it’s generally a good idea to bring your own sheets (if you’ve got enough space). The familiar scent and feel will really help you sleep. Image credits: Shutterstock

Travel Tips

Sleep wrinkles are real. Here’s how they leave their mark

<div class="theconversation-article-body"><a href="https://theconversation.com/profiles/yousuf-mohammed-858232">Yousuf Mohammed</a>, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a>; <a href="https://theconversation.com/profiles/khanh-phan-1489820">Khanh Phan</a>, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a>, and <a href="https://theconversation.com/profiles/vania-rodrigues-leite-e-silva-1497208">Vania Rodrigues Leite E. Silva</a>, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a> You wake up, stagger to the bathroom and gaze into the mirror. No, you’re not imagining it. You’ve developed face wrinkles overnight. They’re sleep wrinkles. Sleep wrinkles are temporary. But as your skin loses its elasticity as you age, they can set in. Here’s what you can do to minimise the chance of them forming in the first place. <h2>How side-sleeping affects your face</h2> Your skin wrinkles for a number of reasons, including ageing, sun damage, smoking, poor hydration, habitual facial expressions (such as grinning, pouting, frowning, squinting) and sleeping positions. When you sleep on your side or stomach, your face skin is <a href="https://academic.oup.com/asj/article/36/8/931/2613967">squeezed and crushed</a> a lot more than if you sleep on your back. When you sleep on your side or stomach, gravity presses your face against the pillow. Your face skin is distorted as your skin is stretched, compressed and pulled in all directions as you move about in your sleep. You can reduce these external forces acting on the face by sleeping on your back or changing positions frequently. <h2>Doctors can tell which side you sleep on by looking at your face</h2> In a young face, sleep wrinkles are transient and disappear after waking. Temporary sleep wrinkles can become persistent with time and repetition. As we <a href="https://pubmed.ncbi.nlm.nih.gov/19624425/">age</a>, our skin <a href="https://pubmed.ncbi.nlm.nih.gov/22233477/">loses elasticity</a> (recoil) and extensibility (stretch), creating <a href="https://pubmed.ncbi.nlm.nih.gov/27329660/">ideal conditions</a> for sleep wrinkles or lines to set in and last longer. The time spent in each sleeping position, the magnitude of external forces applied to each area of the face, as well as the surface area of contact with the pillow surface, also <a href="https://pubmed.ncbi.nlm.nih.gov/27329660/">affects</a> the pattern and rate of sleep wrinkle formation. Skin specialists can often recognise this. People who favour sleeping on one side of their body tend to have a flatter face on their sleeping side and more visible sleep lines. <h2>Can a night skincare routine avoid sleep wrinkles?</h2> Collagen and elastin are two primary components of the dermis (inner layer) of skin. They form the skin structure and maintain the elasticity of skin. <figure class="align-center "><img src="https://images.theconversation.com/files/593034/original/file-20240509-16-hz2ha3.jpg?ixlib=rb-4.1.0&q=45&auto=format&w=754&fit=clip" sizes="(min-width: 1466px) 754px, (max-width: 599px) 100vw, (min-width: 600px) 600px, 237px" srcset="https://images.theconversation.com/files/593034/original/file-20240509-16-hz2ha3.jpg?ixlib=rb-4.1.0&q=45&auto=format&w=600&h=395&fit=crop&dpr=1 600w, https://images.theconversation.com/files/593034/original/file-20240509-16-hz2ha3.jpg?ixlib=rb-4.1.0&q=30&auto=format&w=600&h=395&fit=crop&dpr=2 1200w, https://images.theconversation.com/files/593034/original/file-20240509-16-hz2ha3.jpg?ixlib=rb-4.1.0&q=15&auto=format&w=600&h=395&fit=crop&dpr=3 1800w, https://images.theconversation.com/files/593034/original/file-20240509-16-hz2ha3.jpg?ixlib=rb-4.1.0&q=45&auto=format&w=754&h=496&fit=crop&dpr=1 754w, https://images.theconversation.com/files/593034/original/file-20240509-16-hz2ha3.jpg?ixlib=rb-4.1.0&q=30&auto=format&w=754&h=496&fit=crop&dpr=2 1508w, https://images.theconversation.com/files/593034/original/file-20240509-16-hz2ha3.jpg?ixlib=rb-4.1.0&q=15&auto=format&w=754&h=496&fit=crop&dpr=3 2262w" alt="Skin structure" /><figcaption>The dermis is the inner layer of skin. <a class="source" href="https://www.shutterstock.com/image-vector/skin-structure-old-young-1707589036">mermaid3/Shutterstock</a></figcaption></figure> Supplementing collagen through skincare routines to enhance skin elasticity can <a href="https://pubmed.ncbi.nlm.nih.gov/32799362/">help reduce</a> wrinkle formation. <a href="https://pubmed.ncbi.nlm.nih.gov/30287361/">Hyaluronic</a> acid is a naturally occurring molecule in human bodies. It holds our skin’s collagen and elastin in a proper configuration, stimulates the production of <a href="https://www.mdpi.com/1420-3049/26/15/4429">collagen</a> and adds hydration, which can help slow down wrinkle formation. Hyaluronic acid is one of the most common <a href="https://pubmed.ncbi.nlm.nih.gov/30287361/">active ingredients</a> in skincare creams, gels and lotions. Moisturisers can hydrate the skin in <a href="https://onlinelibrary.wiley.com/doi/10.1111/j.1473-2165.2009.00421.x">different ways</a>. “Occlusive” substances produce a thin layer of oil on the skin that prevents water loss due to evaporation. “Humectants” attract and hold water in the skin, and they can differ in their capacity to bind with water, which influences the degree of skin hydration. <h2>Do silk pillowcases actually make a difference?</h2> Silk pillowcases can make a difference in wrinkle formation, if they let your skin glide and move, rather than adding friction and pressure on a single spot. If you can, use silk sheets and silk pillows. Studies have also <a href="https://academic.oup.com/asj/article/36/8/931/2613967">shown</a> pillows designed to reduce mechanical stress during sleep can prevent skin deformations. Such a pillow <a href="https://www.scirp.org/journal/paperinformation?paperid=67035#:%7E:text=Introduction-,The%20duration%20of%20sleep%20and%20the%20position%20of%20the%20face,permanent%20sleep%20lines%20with%20time.">could be useful</a> in slowing down and preventing the formation of certain facial wrinkles. Sleeping on your back can reduce the risk of sleep lines, as can a nighttime routine of moisturising before sleep. Otherwise, lifestyle choices and habits, such quitting smoking, drinking plenty of water, a healthy diet (eating enough vegetables, <a href="https://www.tandfonline.com/doi/full/10.1080/07315724.2001.10719017?casa_token=uD1flbkLyKUAAAAA%3AsMTWPmxzO3fGHAI41o80B_bWrGrOrvQFeJwF2FtIEnkd73Qmjvyhxr1-GO2kU8_Yc2LYgZp56DqHVg">fruits</a>, nuts, seeds, healthy fats, <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5452251/pdf/nutrients-09-00521.pdf">yogurt and other fermented foods</a>) and regular use of sunscreens can help improve the appearance of the skin on our face.<img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/217380/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /> <a href="https://theconversation.com/profiles/yousuf-mohammed-858232">Yousuf Mohammed</a>, Dermatology researcher, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a>; <a href="https://theconversation.com/profiles/khanh-phan-1489820">Khanh Phan</a>, Postdoctoral Research Fellow, Frazer Institute, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a>, and <a href="https://theconversation.com/profiles/vania-rodrigues-leite-e-silva-1497208">Vania Rodrigues Leite E. Silva</a>, Honorary Associate Professor, Frazer Institute, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a> Image credits: Shutterstock This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/sleep-wrinkles-are-real-heres-how-they-leave-their-mark-217380">original article</a>. </div>

Body

Better sleep is a protective factor against dementia

<div class="theconversation-article-body"><a href="https://theconversation.com/profiles/andree-ann-baril-1494268">Andrée-Ann Baril</a>, <a href="https://theconversation.com/institutions/universite-de-montreal-1743">Université de Montréal</a> and <a href="https://theconversation.com/profiles/matthew-pase-1494296">Matthew Pase</a>, <a href="https://theconversation.com/institutions/monash-university-1065">Monash University</a> Dementia is a progressive loss of cognitive abilities, such as memory, that is significant enough to have an impact on a person’s daily activities. It can be caused by a number of different diseases, including <a href="https://alzheimer.ca/en/about-dementia/what-alzheimers-disease">Alzheimer’s</a>, which is the most common form. Dementia is caused by a loss of neurons over a long period of time. Since, by the time symptoms appear, many changes in the brain have already occurred, many scientists are focusing on studying the risk and protective factors for dementia. A risk factor, or conversely, a protective factor, is a condition or behaviour that increases or reduces the risk of developing a disease, but does not guarantee either outcome. Some risk factors for Alzheimer’s disease and dementia, such as age or genetics, are not modifiable, but there are several other factors we can influence, <a href="https://www.thelancet.com/article/S0140-6736(20)30367-6/fulltext">specifically lifestyle habits and their impact on our overall health</a>. These risk factors include depression, lack of physical activity, social isolation, high blood pressure, obesity, diabetes, excessive alcohol consumption and smoking, as well as poor sleep. We have been focusing our research on the question of sleep for over 10 years, particularly in the context of the <a href="https://www.nhlbi.nih.gov/science/framingham-heart-study-fhs">Framingham Heart Study</a>. In this large community-based cohort study, ongoing since the 1940s, the health of surviving participants has been monitored to the present day. As researchers in sleep medicine and epidemiology, we have expertise in researching the role of sleep and sleep disorders in cognitive and psychiatric brain aging. As part of our research, we monitored and analyzed the sleep of people aged 60 and over to see who did — or did not — develop dementia. <h2>Sleep as a risk or protective factor against dementia</h2> Sleep appears to play an essential role in a number of brain functions, such as memory. Good quality sleep <a href="https://jamanetwork.com/journals/jamaneurology/fullarticle/2793873">could therefore play a vital role in preventing dementia</a>. Sleep is important for maintaining <a href="https://www.science.org/doi/10.1126/science.1241224">good connections in the brain</a>. Recently, research has revealed that sleep seems to have a function similar to that of a garbage truck for the brain: <a href="https://doi.org/10.1016/j.mad.2023.111899">deep sleep could be crucial for eliminating metabolic waste from the brain</a>, including clearing certain proteins, such as those known to accumulate in the brains of people with Alzheimer’s disease. However, the links between deep sleep and dementia still have to be clarified. <h2>What is deep sleep?</h2> During a night’s sleep, we go through several <a href="http://ceams-carsm.ca/en/a-propos-du-sommeil/">sleep stages</a> that succeed one another and are repeated. NREM sleep (non-rapid eye movement sleep) is divided into light NREM sleep (NREM1 stage), NREM sleep (NREM2 stage) and deep NREM sleep, also called slow-wave sleep (NREM3 stage). The latter is associated with several restorative functions. Next, REM sleep (rapid eye movement sleep) is the stage generally associated with the most vivid dreams. An adult generally spends around 15 to 20 per cent of each night in deep sleep, if we add up all the periods of NREM3 sleep. Several sleep changes are common in adults, such as going to bed and waking up earlier, sleeping for shorter periods of time and less deeply, and waking up more frequently during the night. <figure class="align-center zoomable"><a href="https://images.theconversation.com/files/579041/original/file-20240229-16-efo9mx.jpg?ixlib=rb-4.1.0&q=45&auto=format&w=1000&fit=clip"><img src="https://images.theconversation.com/files/579041/original/file-20240229-16-efo9mx.jpg?ixlib=rb-4.1.0&q=45&auto=format&w=754&fit=clip" sizes="(min-width: 1466px) 754px, (max-width: 599px) 100vw, (min-width: 600px) 600px, 237px" srcset="https://images.theconversation.com/files/579041/original/file-20240229-16-efo9mx.jpg?ixlib=rb-4.1.0&q=45&auto=format&w=600&h=279&fit=crop&dpr=1 600w, https://images.theconversation.com/files/579041/original/file-20240229-16-efo9mx.jpg?ixlib=rb-4.1.0&q=30&auto=format&w=600&h=279&fit=crop&dpr=2 1200w, https://images.theconversation.com/files/579041/original/file-20240229-16-efo9mx.jpg?ixlib=rb-4.1.0&q=15&auto=format&w=600&h=279&fit=crop&dpr=3 1800w, https://images.theconversation.com/files/579041/original/file-20240229-16-efo9mx.jpg?ixlib=rb-4.1.0&q=45&auto=format&w=754&h=350&fit=crop&dpr=1 754w, https://images.theconversation.com/files/579041/original/file-20240229-16-efo9mx.jpg?ixlib=rb-4.1.0&q=30&auto=format&w=754&h=350&fit=crop&dpr=2 1508w, https://images.theconversation.com/files/579041/original/file-20240229-16-efo9mx.jpg?ixlib=rb-4.1.0&q=15&auto=format&w=754&h=350&fit=crop&dpr=3 2262w" alt="" /></a><figcaption>Sleep stages, and the role of deep sleep for brain health. (Andrée-Ann Baril)</figcaption></figure> <h2>Loss of deep sleep linked to dementia</h2> Participants in the <a href="https://jamanetwork.com/journals/jamaneurology/fullarticle/2810957">Framingham Heart Study</a> were assessed using a sleep recording — known as polysomnography — on two occasions, approximately five years apart, in 1995-1998 and again in 2001-2003. Many people showed a reduction in their deep slow-wave sleep over the years, as is to be expected with aging. Conversely, the amount of deep sleep in some people remained stable or even increased. Our team of researchers from the Framingham Heart Study followed 346 participants aged 60 and over for a further 17 years to observe who developed dementia and who did not. Progressive loss of deep sleep over time was associated with an increased risk of dementia, whatever the cause, and particularly Alzheimer’s type dementia. These results were independent of many other risk factors for dementia. Although our results do not prove that loss of deep sleep causes dementia, they do suggest that it could be a risk factor in the elderly. Other aspects of sleep may also be important, such as its duration and quality. <h2>Strategies to improve deep sleep</h2> Knowing the impact of a lack of deep sleep on cognitive health, what strategies can be used to improve it? First and foremost, if you’re experiencing sleep problems, it’s worth talking to your doctor. Many sleep disorders are underdiagnosed and treatable, particularly through behavioural (i.e. non-medicinal) approaches. Adopting good sleep habits can help, such as going to bed and getting up at consistent times or avoiding bright or blue light in bed, like that of screens. You can also avoid caffeine, limit your alcohol intake, maintain a healthy weight, be physically active during the day, and sleep in a comfortable, dark and quiet environment. The role of deep sleep in preventing dementia remains to be explored and studied. Encouraging sleep with good lifestyle habits could have the potential to help us age in a healthier way.<img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/222854/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /> <a href="https://theconversation.com/profiles/andree-ann-baril-1494268">Andrée-Ann Baril</a>, Professeure-chercheure adjointe au Département de médecine, <a href="https://theconversation.com/institutions/universite-de-montreal-1743">Université de Montréal</a> and <a href="https://theconversation.com/profiles/matthew-pase-1494296">Matthew Pase</a>, Associate Professor of Neurology and Epidemiology, <a href="https://theconversation.com/institutions/monash-university-1065">Monash University</a> Image credits: Getty Images This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/better-sleep-is-a-protective-factor-against-dementia-222854">original article</a>. </div>

Mind

Could not getting enough sleep increase your risk of type 2 diabetes?

<a href="https://theconversation.com/profiles/giuliana-murfet-1517219">Giuliana Murfet</a>, <a href="https://theconversation.com/institutions/university-of-technology-sydney-936">University of Technology Sydney</a> and <a href="https://theconversation.com/profiles/shanshan-lin-1005236">ShanShan Lin</a>, <a href="https://theconversation.com/institutions/university-of-technology-sydney-936">University of Technology Sydney</a> Not getting enough sleep is a common affliction in the modern age. If you don’t always get as many hours of shut-eye as you’d like, perhaps you were concerned by news of a <a href="https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2815684">recent study</a> that found people who sleep less than six hours a night are at higher risk of type 2 diabetes. So what can we make of these findings? It turns out the relationship between sleep and diabetes is complex. <h2>The study</h2> Researchers analysed data from the <a href="https://www.ukbiobank.ac.uk/">UK Biobank</a>, a large biomedical database which serves as a global resource for health and medical research. They looked at information from 247,867 adults, following their health outcomes for more than a decade. The researchers wanted to understand the associations between sleep duration and type 2 diabetes, and whether a healthy diet reduced the effects of short sleep on diabetes risk. As part of their involvement in the UK Biobank, participants had been asked roughly how much sleep they get in 24 hours. Seven to eight hours was the average and considered normal sleep. Short sleep duration was broken up into three categories: mild (six hours), moderate (five hours) and extreme (three to four hours). The researchers analysed sleep data alongside information about people’s diets. Some 3.2% of participants were diagnosed with type 2 diabetes during the follow-up period. Although healthy eating habits were associated with a lower overall risk of diabetes, when people ate healthily but slept less than six hours a day, their risk of type 2 diabetes increased compared to people in the normal sleep category. The researchers found sleep duration of five hours was linked with a 16% higher risk of developing type 2 diabetes, while the risk for people who slept three to four hours was 41% higher, compared to people who slept seven to eight hours. One limitation is the study defined a healthy diet based on the number of servings of fruit, vegetables, red meat and fish a person consumed over a day or a week. In doing so, it didn’t consider how dietary patterns such as time-restricted eating or the Mediterranean diet may modify the risk of diabetes among those who slept less. Also, information on participants’ sleep quantity and diet was only captured at recruitment and may have changed over the course of the study. The authors acknowledge these limitations. <h2>Why might short sleep increase diabetes risk?</h2> In people with <a href="https://www.diabetesaustralia.com.au/about-diabetes/type-2-diabetes/">type 2 diabetes</a>, the body becomes resistant to the effects of a hormone called insulin, and slowly loses the capacity to produce enough of it in the pancreas. Insulin is important because it regulates glucose (sugar) in our blood that comes from the food we eat by helping move it to cells throughout the body. We don’t know the precise reasons why people who sleep less may be at higher risk of type 2 diabetes. But <a href="https://doi.org/10.7759/cureus.23501">previous research</a> has shown sleep-deprived people often have increased <a href="https://doi.org/10.1186/1476-511X-9-125">inflammatory markers</a> and <a href="https://doi.org/10.1007/s00125-015-3500-4">free fatty acids</a> in their blood, which <a href="https://doi.org/10.1007/s11892-018-1055-8">impair insulin sensitivity</a>, leading to <a href="https://doi.org/10.7759/cureus.23501">insulin resistance</a>. This means the body struggles to use insulin properly to regulate blood glucose levels, and therefore increases the risk of type 2 diabetes. Further, people who don’t sleep enough, as well as people who sleep in irregular patterns (such as shift workers), experience disruptions to their body’s natural rhythm, known as the <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5995632/">circadian rhythm</a>. This can interfere with the release of hormones like <a href="https://doi.org/10.1210/edrv.18.5.0317">cortisol, glucagon and growth hormones</a>. These hormones are released through the day to meet the body’s changing energy needs, and normally keep blood glucose levels nicely balanced. If they’re compromised, this may reduce the body’s ability to handle glucose as the day progresses. These factors, and <a href="https://www.science.org/doi/10.1126/sciadv.aar8590">others</a>, may contribute to the increased risk of type 2 diabetes seen among people sleeping less than six hours. While this study primarily focused on people who sleep eight hours or less, it’s possible longer sleepers may also face an increased risk of type 2 diabetes. Research has previously shown a U-shaped correlation between sleep duration and type 2 diabetes risk. A <a href="https://doi.org/10.2337/dc14-2073">review</a> of multiple studies found getting between seven to eight hours of sleep daily was associated with the lowest risk. When people got less than seven hours sleep, or more than eight hours, the risk began to increase. The reason sleeping longer is associated with increased risk of type 2 diabetes may be linked to <a href="https://doi.org/10.2337/dc15-0186">weight gain</a>, which is also correlated with longer sleep. Likewise, people who don’t sleep enough are more likely to be <a href="https://doi.org/10.1016/j.sleh.2017.07.013">overweight or obese</a>. <h2>Good sleep, healthy diet</h2> Getting enough sleep is an important part of a healthy lifestyle and may reduce the risk of type 2 diabetes. Based on this study and other evidence, it seems that when it comes to diabetes risk, seven to eight hours of sleep may be the sweet spot. However, other factors could influence the relationship between sleep duration and diabetes risk, such as individual differences in sleep quality and lifestyle. While this study’s findings question whether a healthy diet can mitigate the effects of a lack of sleep on diabetes risk, a wide range of evidence points to the benefits of <a href="https://www.who.int/initiatives/behealthy/healthy-diet">healthy eating</a> for overall health. The <a href="https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2815684">authors of the study</a> acknowledge it’s not always possible to get enough sleep, and suggest doing <a href="https://pubmed.ncbi.nlm.nih.gov/33137489/">high-intensity interval exercise</a> during the day may offset some of the potential effects of short sleep on diabetes risk. In fact, exercise <a href="https://doi.org/10.1016/j.jshs.2023.03.001">at any intensity</a> can improve blood glucose levels.<img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/225179/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /> <a href="https://theconversation.com/profiles/giuliana-murfet-1517219">Giuliana Murfet</a>, Casual Academic, Faculty of Health, <a href="https://theconversation.com/institutions/university-of-technology-sydney-936">University of Technology Sydney</a> and <a href="https://theconversation.com/profiles/shanshan-lin-1005236">ShanShan Lin</a>, Senior Lecturer, School of Public Health, <a href="https://theconversation.com/institutions/university-of-technology-sydney-936">University of Technology Sydney</a> Image credits: Getty Images This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/could-not-getting-enough-sleep-increase-your-risk-of-type-2-diabetes-225179">original article</a>.

Body

The unique travel hack that is guaranteed to help beat jet lag

Experts have revealed how to beat jet lag on your next overseas holiday, and it all comes down to your modes of transport. Sleep researchers said it's good news for cruise lovers, as exposure to sea air and bright natural light improves sleep to cure the annoying condition quickly. Some experts say to avoid travelling by plane all together, and always opt for cruising holidays instead. However, if you have to travel to your cruise by plane, being on board is a great way to tackle the dreadful feeling, compared with holidaying on land, Panache Cruises said. Dr Lindsay Browning, expert at Trouble Sleeping said exposing yourself to bright lights at the right time after a long-haul flight is one of the most powerful things we can do to boost and help shift circadian rhythm, and being on a ship is the perfect place for that. "As a general rule, you want to get lots of bright light exposure during the daytime and avoid light at night," Browning said. "When travelling on a cruise ship, you will naturally get a lot of bright light exposure during the day, helping your circadian rhythm.” "Further, when travelling by ship you will have a cabin with a proper bed and curtain, enabling you to sleep at night when you want to." The company claimed research showed how prolonged exposure to sea air can improve blood oxygen levels, boost vitamin D, and improve breathing leading to higher-quality sleep, helping to rid travellers of pesky jet lag so they can enjoy their holidays. Image credits: Getty Images

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Better sleep is a protective factor against dementia

Could not getting enough sleep increase your risk of type 2 diabetes?

The unique travel hack that is guaranteed to help beat jet lag