  {"id":692222,"date":"2026-01-26T10:54:47","date_gmt":"2026-01-26T15:54:47","guid":{"rendered":"https:\/\/www.rochester.edu\/newscenter\/?p=692222"},"modified":"2026-07-05T12:03:03","modified_gmt":"2026-07-05T16:03:03","slug":"why-is-sleep-important-brain-glymphatic-system-692222","status":"publish","type":"post","link":"https:\/\/www.rochester.edu\/newscenter\/why-is-sleep-important-brain-glymphatic-system-692222\/","title":{"rendered":"Why is sleep so important? Your brain depends on it"},"content":{"rendered":"<div class=\"wp-embed\">\n<div class=\"wp-embed-wrap\"><iframe loading=\"lazy\" title=\"Ever Wonder: Why Do We Sleep?\" width=\"1062\" height=\"597\" src=\"https:\/\/www.youtube.com\/embed\/kgpgbHvnBFM?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Sleep does more than restore energy\u2014it activates the brain\u2019s waste-clearing system, protecting long-term brain health.<\/p>\n","protected":false},"author":372,"featured_media":692352,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[42472],"tags":[41792,18632,8366,42492,18572,43102,41012],"class_list":["post-692222","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-health-medicine","tag-ever-wonder","tag-hajim-school-of-engineering-and-applied-sciences","tag-maiken-nedergaard","tag-medical-center","tag-research-finding","tag-research-impact-advances","tag-videos"],"acf":{"external":"","hide_featured_image":true,"related":"show_related","style":[679652,686022,666092],"content_modules":[{"acf_fc_layout":"text","anchor":"","css_class":"pt-15","title":"","content":"<h2>URochester researchers have revealed that sleep does more than restore energy\u2014it activates the brain\u2019s waste-clearing system, protecting long-term brain health.<\/h2>\r\nFor as long as humans have been thinking about thinking, we\u2019ve wondered why we sleep. From an evolutionary standpoint, it seems like a terrible idea: every night, we willingly surrender consciousness, mobility, and vigilance\u2014leaving ourselves vulnerable to predators, accidents, and the elements. And yet sleep, which is essentially universal across the animal kingdom, is unavoidable.\r\n\r\nAt the <a href=\"https:\/\/www.rochester.edu\/\">糖心传媒<\/a>, researchers have helped answer this ancient question. It turns out that sleep is not a passive state at all. Instead, it\u2019s a critical time when the brain performs one of its most important jobs: cleaning itself.\r\n<h3>A once-hidden network: the glymphatic system<\/h3>\r\nIn 2012, URochester neuroscientist\u202fMaiken Nedergaard\u202fand her colleagues <a href=\"https:\/\/www.urmc.rochester.edu\/news\/story\/scientists-discover-previously-unknown-cleansing-system-in-brain\">discovered the\u202fglymphatic system<\/a>, a previously unknown network that clears toxic waste from the brain. This system uses cerebrospinal fluid to flush away proteins such as beta-amyloid and tau\u2014substances linked to Alzheimer\u2019s and other neurodegenerative diseases.\r\n\r\nCrucially, this cleaning process is most active during\u202fdeep, non-REM (rapid eye movement) sleep. When we sleep, brain cells subtly shrink, creating space for fluid to flow more freely through brain tissue. The glymphatic system synchronizes brain waves, blood flow, and cerebrospinal fluid movement, turning sleep into a nightly maintenance cycle for brain health.\r\n\r\nThis discovery fundamentally changed how scientists understand\u202fwhy sleep is important. Sleep is not just downtime for the brain\u2014it\u2019s an active, essential biological process that supports memory, cognition, and long-term neurological resilience.","background_color":"#ffffff","width":"width-medium"},{"acf_fc_layout":"media_text_new","anchor":"","class":"","overline":"","title":"<h3>What does sleep do besides just give us rest?<\/h3>","content":"It allows our brain to clear toxic waste that if left alone could lead to neurological disorders. With her discovery of the glymphatic system, URochester neuroscientist Maiken Nedergaard has fundamentally reshaped our understanding of brain physiology and the biological purpose of sleep.","cta":"","bg":"#00205b","type":"embed","image":"","embed":"https:\/\/youtu.be\/x_go148NwkY","video":"","layout":"left","animation":"animation-false"},{"acf_fc_layout":"text","anchor":"","css_class":"pt-15","title":"","content":"<h3>When sleep is disrupted, brain health suffers<\/h3>\r\nThe discovery of the glymphatic system has opened entirely new avenues of research for scientists across the globe. As a result, researchers have come to appreciate that not all sleep is created equal.\r\n\r\nURochester researchers specifically have studied the role of <a href=\"https:\/\/www.urmc.rochester.edu\/news\/story\/common-sleep-aid-may-leave-behind-a-dirty-brain\">disrupted sleep<\/a>, <a href=\"https:\/\/www.urmc.rochester.edu\/news\/story\/circadian-rhythms-help-guide-waste-from-brain\">circadian rhythms<\/a>, <a href=\"https:\/\/www.urmc.rochester.edu\/news\/story\/not-all-sleep-is-equal-when-it-comes-to-cleaning-the-brain\">aging<\/a>, <a href=\"https:\/\/www.rochester.edu\/newscenter\/study-suggests-how-high-blood-pressure-might-contribute-to-alzheimers-360432\/\">high blood pressure<\/a>, and <a href=\"https:\/\/www.urmc.rochester.edu\/news\/story\/pulling-the-plug-on-brain-injury\">traumatic brain injury<\/a> in affecting glymphatic function, reducing the brain\u2019s ability to clear waste efficiently.\r\n\r\nIn laboratory studies, Nedergaard\u2019s team found that the commonly prescribed <a href=\"https:\/\/www.urmc.rochester.edu\/news\/story\/common-sleep-aid-may-leave-behind-a-dirty-brain\">sleep aid zolpidem (Ambien) suppressed glymphatic activity<\/a> in mice, suggesting that some sedatives may interfere with the brain\u2019s natural cleaning mechanisms. These findings highlight the importance of preserving\u202fhealthy sleep architecture, not just logging enough hours in bed.\r\n<h3>From fundamental discoveries to brand-new therapies<\/h3>\r\nBuilding on these insights, URochester scientists are exploring how to restore or enhance glymphatic function. Collaborations with engineers at the University\u2019s <a href=\"https:\/\/www.hajim.rochester.edu\/\">Hajim School of Engineering &amp; Applied Sciences<\/a> have demonstrated that<a href=\"https:\/\/www.rochester.edu\/newscenter\/cleaning-up-the-aging-brain-616872\/\"> stimulating lymphatic vessel contractions<\/a> can revive age-related declines in brain fluid clearance\u2014at least in animal models. Nedergaard also maintains a lab at the University of Copenhagen, connecting European scientists and collaborators with this research.\r\n\r\nThe question of why we sleep no longer belongs only to philosophers. At the University of Rochester, it has become a matter of biology, fluid dynamics, and brain health. With major federal funding and leading global partnerships, this research is opening new paths for treating and preventing neurological diseases, improving drug delivery to the brain, and designing sleep-based interventions that support lifelong brain health.\r\n\r\nBut for all its global reach and clinical promise, the impact of this research is ultimately intimate\u2014and personal. Each night, when consciousness fades and the world recedes, our brains go to work\u2014clearing waste, protecting themselves, and quietly preparing us for what comes next.","background_color":"#ffffff","width":"width-medium"}]},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Why is sleep so important? 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