![]() ![]() National Library of Medicine, Biotech Information The National Center for Biotechnology Information advances science and health by providing access to biomedical and genomic information. Body temperature during sleep drops by one to two degrees fahrenheitĭivision of Sleep Medicine at Harvard Medical School A production of WGBH Educational Foundation and the Harvard Medical School Division of Sleep Medicine.National Institute of General Medical Sciences (NIGMS) The NIGMS supports basic research that increases our understanding of biological processes and lays the foundation for advances in disease diagnosis, treatment, and prevention. The key driver of the body’s circadian rhythm, or internal clock, is the suprachiasmatic nucleus (SCN) in the brain, which is made up of around 20,000 neurons.National Institute of Neurological Disorders and Stroke (NINDS) NINDS aims to seek fundamental knowledge about the brain and nervous system and to use that knowledge to reduce the burden of neurological disease. On average, we spend about two hours per night dreaming.REM sleep makes up between 20-25% of total sleepĭivision of Sleep Medicine at Harvard Medical School A production of WGBH Educational Foundation and the Harvard Medical School Division of Sleep Medicine.National Center for Biotechnology Information The National Center for Biotechnology Information advances science and health by providing access to biomedical and genomic information. In a normal sleep period, a person experiences four to six sleep cycles.Read our full Advertising Disclosure for more information. Although Sleep Foundation maintains affiliate partnerships with brands and e-commerce portals, these relationships never have any bearing on our product reviews or recommendations. ![]() Writers and editors caught stealing content or improperly citing sources are immediately terminated, and we will work to rectify the situation with the original publisher(s) Inaccurate or unverifiable information will be removed prior to publication. A member of our medical expert team provides a final review of the content and sources cited for every guide, article, and product review concerning medical- and health-related topics.These internal links are intended to improve ease of navigation across the site, and are never used as original sources for scientific data or information. Some guides and articles feature links to other relevant Sleep Foundation pages.Each guide and article includes a comprehensive bibliography with full citations and links to the original sources. All scientific data and information must be backed up by at least one reputable source.These include peer-reviewed journals, government reports, academic and medical associations, and interviews with credentialed medical experts and practitioners. We only cite reputable sources when researching our guides and articles.Guidelines for our testing methodology are as follows: This hands-on approach allows us to provide accurate, data-driven recommendations for mattresses, pillows, sheets, and other sleep essentials. At Sleep Foundation, we personally test every product featured in our reviews and guides. ![]()
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