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sleep stages

sleep stages

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Sleep is made up of four stages. These four stages can be subdivided into non-rapid-eye-movement (NREM, which typically makes up about 75% of your time asleep; Stages 1, 2, and 3) and rapid eye movement (REM, which makes up the other 25% of sleep). As you progress from wakefulness to deep sleep, you usually pass through progressively deeper stages, from stage 1 (the lightest) to stage 3 or slow wave sleep, (the deepest stage, in which critical substances such as growth hormone are released), and finally into REM sleep (during which the body doesn’t move and dreaming occurs). It is not uncommon for a person to move back and forth between stages 2 and 3 before moving into REM sleep. A typical sleep cycle lasts about 90 minutes, with more stage 3 sleep occurring earlier in the sleep period and more REM sleep later in the sleep period.

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