Non-REM sleep is defined as all types of sleep that occur in the absence of rapid eye movements. It is made up of 4 different stages which transition from light to deep sleep. The brain waves during stages 3 and 4 are of a characteristically low frequency (slow) and high amplitude. Movement can occur during non-REM sleep, and stages 3 and 4 are when sleep walking and talking are most likely to occur.
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