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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 ... The sleep cycle of alternate NREM and REM sleep takes an average of 90 minutes, occurring 4–6 times in a good night's sleep. The American ...

en.wikipedia.org/wiki/Sleep_cycle

The sleep cycle is an oscillation between the slow-wave and REM (paradoxical) phases of sleep, sometimes called the ultradian sleep cycle, sleep–dream cycle, or REM-NREM cycle, to distinguish it from the circadian alternation between sleep and wakefulness. In humans this cycle takes 1–2 hours.

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 ...

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

Feb 16, 2011 ... The way modern humans get eight hours of sleep isn't actually ... Wehr concluded that biphasic sleeping is the most natural sleep pattern, and ...

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

Jul 26, 2013 ... In my last post, I asked "are you getting enough sleep?" Today, in an effort to better understand the role of sleep in our lives, I ask a very basic ...

www.bbc.com/news/magazine-16964783

Feb 22, 2012 ... In a full sleep cycle, a person goes through all the stages of sleep from one ... " Waking up during the night is part of normal human physiology.".

www.tuck.com/stages

May 7, 2017 ... Rather, a sleep cycle progress through the stages of non-REM sleep ... During deep sleep, human growth hormone is released and restores ...

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 ...