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en.wikipedia.org/wiki/Sleep

Sleep is a naturally recurring state of mind and body, characterized by altered consciousness, .... circadian disruption. Scientific studies on sleep have shown that sleep stage at awakening is an important factor in amplifying sleep inertia.

www.centerforsoundsleep.com/sleep-disorders/stages-of-sleep

This first stage of sleep is called the “introduction into sleep”. It is frequently observed by watching someone's head nod when they are listening to a dull lecture.

www.tuck.com/stages

May 7, 2017 ... Usually sleepers pass through five stages: 1, 2, 3, 4 and REM (rapid eye movement) sleep. These stages progress cyclically from 1 through ...

sleep.org/articles/what-happens-during-sleep

Find out what happens during the various stages of sleep with this guide to sleep cycles, including REM and Non-REM sleep.

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

Oct 16, 2016 ... WebMD explains the stages of sleep -- REM and non-REM -- and how age affects these cycles.

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

Mar 17, 2015 ... When we sleep at night, we typically go through several sleep cycles. And each one of these cycles consists of 4 different stages of sleep.

www.sleepassociation.org/patients-general-public/what-is-sleep

During sleep, we usually pass through five phases of sleep: stages 1, 2, 3, 4, and REM (rapid eye movement) sleep. These stages progress in a cycle from stage ...

www.howsleepworks.com/types_nonrem.html

Non-REM sleep, which is perhaps best defined negatively as any sleep not recognizable as REM sleep, consists of three separate stages (stage1, stage 2 and ...

psychcentral.com/lib/stages-of-sleep

Do you ever wonder why you don't dream when you sleep? The truth is, if you are getting proper amounts of sleep in proper time periods, and not taking.