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<h2 class="element-invisible">You are here</h2><div class="breadcrumb"><a href="/">Home</a> » <a href="/news-events">News & Events</a> » <a href="/news-events/nih-research-matters">NIH Research Matters</a></div> <div class="l-region l-region--section-header">
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<p class="publishdate"><span property="dc:date" datatype="xsd:dateTime" content="2021-04-27T00:00:00-04:00" class="date-display-single">April 27, 2021</span></p><div class='syndicate'><h1>Lack of sleep in middle age may increase dementia risk</h1><div class="callout callout-with-border"><h3>At a Glance</h3>
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<ul>
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<li>People who slept six hours or less per night in their 50s and 60s were more likely to develop dementia later in life. </li>
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<li>The findings suggest that inadequate sleep duration could increase dementia risk and emphasize the importance of good sleep habits.</li>
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</ul></div><div class="media-float-right"><div class="ds-1col file file-image file-image-jpeg view-mode-floated_media clearfix">
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<picture title="Woman in bed with eyes open touching clock on nightstand">
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<!--[if IE 9]><video style="display: none;"><![endif]-->
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-large/public/news-events/research-matters/2021/20210427-sleep.jpg?itok=prTli3Od&timestamp=1619525085 1x" media="screen and (min-width: 960px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium/public/news-events/research-matters/2021/20210427-sleep.jpg?itok=ckASNxVM&timestamp=1619525085 1x" media="screen and (min-width: 800px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium-small/public/news-events/research-matters/2021/20210427-sleep.jpg?itok=mgUJiZGd&timestamp=1619525085 1x" media="screen and (min-width: 600px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-small/public/news-events/research-matters/2021/20210427-sleep.jpg?itok=p5hR17qk&timestamp=1619525085 1x" media="screen and (min-width: 480px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-tiny/public/news-events/research-matters/2021/20210427-sleep.jpg?itok=jqNSGMmj&timestamp=1619525085 1x" media="screen and (min-width: 0)" />
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<!--[if IE 9]></video><![endif]-->
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<img src="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium/public/news-events/research-matters/2021/20210427-sleep.jpg?itok=ckASNxVM&timestamp=1619525085" alt="Woman in bed with eyes open touching clock on nightstand" title="Woman in bed with eyes open touching clock on nightstand" />
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</picture><span class="caption">The study explored the links between sleep and dementia. </span><span class="credit">tab1962 / iStock / Getty Images Plus</span></div>
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</div><p>Changes in sleep patterns are common in people with Alzheimer’s disease and other dementias. They may wake up often during the night and find it hard to get back to sleep. These sleep problems are thought to result from brain changes caused by the disease that affect the sleep-wake cycle.</p>
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||
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||
<p>Studies have suggested that sleep patterns earlier in life may contribute to later dementia risk. Both insufficient sleep and sleeping longer than average have been linked to a greater likelihood of developing dementia. However, it has been hard to determine whether these sleep changes contribute to the disease or simply reflect early symptoms.</p>
|
||
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||
<p>Many of the studies on sleep and dementia risk have followed participants for less than a decade and focused on people over the age of 65. A study led by Dr. Séverine Sabia of Inserm and University College London examined how sleep patterns earlier in life may affect the onset of dementia decades later.</p>
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||
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<p>The study was supported in part by NIH’s National Institute on Aging (NIA). Findings appeared in <em>Nature Communications</em> on April 20, 2021.</p>
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||
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||
<p>The researchers examined data from nearly 8,000 people in Britain starting at age 50. Participants were assessed on a wide variety of measures, including being asked on six occasions between 1985 and 2016 how many hours they slept a night. To assess the accuracy of this self-reporting, some of the participants wore accelerometers to objectively measure sleep time. Over the course of the study, 521 participants were diagnosed with dementia, at an average age of 77.</p>
|
||
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||
<p>Analysis of the data showed that people in their 50s and 60s getting six hours of sleep or less were at greater risk of developing dementia later. Compared to those getting normal sleep (defined as 7 hours), people getting less rest each night were 30% more likely to be diagnosed with dementia.</p>
|
||
|
||
<p>The researchers adjusted their model to account for other factors known to influence sleep patterns or dementia risk, including smoking, physical activity, body mass index, and medical conditions like diabetes and heart disease. They also separated out people with mental illnesses like depression, which are strongly linked to sleep disturbances.</p>
|
||
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||
<p>The findings suggest that short sleep duration during midlife could increase the risk of developing dementia later in life. More research is needed to confirm this connection and understand the underlying reasons. </p>
|
||
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||
<p>“While we cannot confirm that not sleeping enough actually increases the risk of dementia, there are plenty of reasons why a good night’s sleep might be good for brain health,” Sabia says.</p>
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<p>Quality sleep is known to play an important role in concentration and learning, as well as mood and overall health.</p>
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<p>—by Erin Bryant</p></div><h2 class="label-above">Related Links</h2><ul class="spaced print-urls"><li><a href="https://www.nih.gov/news-events/nih-research-matters/sleep-deprivation-increases-alzheimers-protein" target="_top">Sleep Deprivation Increases Alzheimer’s Protein</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/weekend-catch-cant-counter-chronic-sleep-deprivation" target="_top">Weekend Catch-Up Can’t Counter Chronic Sleep Deprivation</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/gene-identified-people-who-need-little-sleep" target="_top">Gene Identified in People Who Need Little Sleep</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/how-disrupted-sleep-may-lead-heart-disease" target="_top">How Disrupted Sleep May Lead to Heart Disease</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/molecular-ties-between-lack-sleep-weight-gain" target="_top">Molecular Ties Between Lack of Sleep and Weight Gain</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/how-sleep-clears-brain" target="_top">How Sleep Clears the Brain</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/sleep-memory-aging-brain" target="_top">Sleep and Memory in the Aging Brain</a></li><li><a href="https://newsinhealth.nih.gov/2021/04/good-sleep-good-health" target="_top">Good Sleep for Good Health</a></li><li><a href="https://www.nia.nih.gov/health/topics/sleep" target="_top">Sleep</a></li></ul><p class="footnote"><strong class="label-inline">References: </strong><a href="https://pubmed.ncbi.nlm.nih.gov/33879784/">Association of sleep duration in middle and old age with incidence of dementia.</a> Sabia S, Fayosse A, Dumurgier J, van Hees VT, Paquet C, Sommerlad A, Kivimäki M, Dugravot A, Singh-Manoux A. <em>Nat Commun</em>. 2021 Apr 20;12(1):2289. doi: 10.1038/s41467-021-22354-2. PMID: 33879784.</p><p class="footnote"><strong class="label-inline">Funding: </strong>NIH’s National Institute on Aging (NIA); Wellcome Trust; UK Medical Research Council; British Heart Foundation; NordForsk; Academy of Finland; Helsinki Institute of Life Science; University College London Hospital; French National Research Agency.</p>
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<p><a href="https://www.nih.gov/news-events/nih-research-matters/research-context-can-we-slow-aging">Research in Context: Can we slow aging?</a></p>
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<p><a href="https://www.nih.gov/news-events/nih-research-matters/brain-changes-observed-during-pregnancy">Brain changes observed during pregnancy</a></p>
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<p><a href="https://www.nih.gov/news-events/nih-research-matters/risk-future-burden-dementia-united-states">Risk and future burden of dementia in the United States </a></p>
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<p><a href="https://www.nih.gov/news-events/nih-research-matters/complete-wiring-map-adult-fruit-fly-brain">Complete wiring map of an adult fruit fly brain</a></p>
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<p><strong>Editor:</strong> Harrison Wein, Ph.D.</p>
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<p><strong>Assistant Editors:</strong> Vicki Contie and Brian Doctrow, Ph.D.</p>
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<p><strong><em>NIH Research Matters </em></strong>is a weekly update of NIH research highlights reviewed by NIH’s experts. It's published by the <a href="/institutes-nih/nih-office-director/office-communications-public-liaison">Office of Communications and Public Liaison</a> in the <a href="/institutes-nih/nih-office-director">NIH Office of the Director</a>.</p>
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