REM definition
Before REM sleep, the three prior stages of sleep occur progressively slow bodily function and brain activity. These stages are known as non-REM or N1, N2, and N3.
However, during REM sleep, the eyes move rapidly sideways. The heart rate, respiratory rate and blood pressure increase to their values while awake.
REM sleep is the longest period of the sleep cycle, lasting 70 to 120 minutes.
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