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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 ... Sleep was once considered an inactive, or passive, state in which both .... 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 natural. ... "The dominant pattern of sleep, arguably since time immemorial, was ...

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.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 ...

health.nokia.com/blog/2015/03/17/the-4-different-stages-of-sleep

Mar 17, 2015 ... And each one of these cycles consists of 4 different stages of sleep. Let's go ... Some say it is a vestigial reflex humans developed during the ...

www.tuck.com/stages

Aug 28, 2017 ... Rather, a sleep cycle progress through the stages of non-REM sleep ... During deep sleep, human growth hormone is released and restores ...

www.sleepcycle.com/how-it-works

Sleep Cycle alarm clock tracks your sleep patterns and wakes you up during light sleep.