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 Optionincreased beta activityimproved mental functionincreased delta activity in some brain regions