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REM Sleep |
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Rapid Eye Movement is defined as the rapid periodic jerky movement of the eyes during certain stages of the sleep cycle when dreaming takes place. There are 5 phases or stages of sleep that are repeated approximately every 90 minutes (sleep stages and sleep phases) in each night.
Researchers and scientists have divided non-REM sleep into four stages, which accounts for about 75% of total sleep. In each stage, brain waves become progressively larger and slower, and sleep becomes deeper. After reaching stage 4, the deepest period, the pattern reverses, and sleep becomes progressively lighter until REM sleep, the most active period, occurs. This complete sleep cycle typically occurs about once every 90 minutes in humans.
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