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en.wikipedia.org/wiki/Sleep

Sleep is a naturally recurring state of mind and body characterized by altered consciousness, ... During slow-wave sleep, humans secrete bursts of growth hormone. All sleep ... One study found 3% awake time in the first ninety-minute sleep cycle, 8% in the second, 10% in the third, 12% in the fourth, and 13–14% in the fifth.

healthysleep.med.harvard.edu/healthy/science/what/sleep-patterns-rem-nrem

Dec 18, 2007 ... In fact, we are programmed to sleep each night as a means of restoring ... The average length of the first NREM-REM sleep cycle is between 70 ...

sleepdisorders.sleepfoundation.org/chapter-1-normal-sleep/stages-of-human-sleep

Next: Sleep Cycles Previous: Abnormal Sleep & Sleep Disorders ... Figure 1.1: Characteristic electroencephalogram patterns of human sleep stages.24.

www.howsleepworks.com/how_circadian.html

Scientists now estimate than between 8% and 15% of the genes in the human body operate on a 24-hour cycle. The very similar sleep architecture of ...

www.livescience.com/12891-natural-sleep.html

Feb 16, 2011 ... The way modern humans get eight hours of sleep isn't actually natural. Life's Little Mysteries consults the experts on how we should be doing it.

www.howsleepworks.com/types_rem.html

REM sleep occurs in cycles of about 90-120 minutes throughout the night, and it accounts for up to 20-25% of total sleep time in adult humans, although the ...

www.webmd.com/sleep-disorders/guide/sleep-101

Oct 16, 2016 ... First comes non-REM sleep, followed by a shorter period of REM sleep, and then the cycle starts over again. Dreams typically happen during ...

www.ninds.nih.gov/Disorders/Patient-Caregiver-Education/Understanding-Sleep

People who have lost their sight and cannot coordinate their natural wake-sleep cycle using natural light can stabilize their sleep patterns by taking small ...

www.psychologytoday.com/blog/between-you-and-me/201307/your-sleep-cycle-revealed

Jul 26, 2013 ... The sleep cycle: A sleep cycle lasts about 90 minutes and during that time we move through five stages of sleep. The first four stages make up ...