What is rem and non rem sleep ? What are the similarities in them and what are the differences between them?
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During REM sleep, your eyes move quickly in different directions. That doesn't happen during non-REM sleep. Dreams typically happen during REM sleep. sleep begins with a NREM sleep stage, cycles through the three NREM stages, and is followed by a REM period. Throughout the night, NREM and REM sleep alternate in a cyclical fashion, over approximately 90 minutes with REM sleep periods getting progressively longer.
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