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NutriSleep

by atarah michal (2019-05-24)

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You don't notice it, of course, but while you're asleep, your brain is still active. As people Sleep, their brains pass through five stages of sleep. Together, stages 1, 2, 3, 4, and REM (rapid eye movement) sleep make up a sleep cycle. One complete sleep cycle lasts about 90 to 100 minutes. So during an average night's sleep, a person will experience about four or five cycles of sleep.
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