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The sleep cycle consists of periods of non-REM sleep and REM sleep. We spend approximately 75% of sleep time in non-REM sleep. There are four stages to the non-REM sleep cycle. Stages 3 and 4 are characterized​ as having slow wave sleep.

The hypothesis that slow-wave sleep allows the brain to rest is supported by studies that demonstrate
Select Option increased beta activityimproved mental functionincreased delta activity in some brain regions
during slow-wave sleep.
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