Human Growth and Development / Unit 3 HGD 0307 short lesson, about 20 seconds
REM and NREM Sleep
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The idea
REM sleep, called active sleep, brings eye movement and waking-like brain waves; NREM sleep has three stages, the third the deepest.
In practice
A sleep cycle lasting about sixty minutes at two or three, and ninety in adults.
Where people slip
REM sleep is linked to dreaming, memory consolidation, emotional processing and brain development.
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