REM sleep occurs throughout the night, with each cycle getting longer as the night goes on. This paralysis is thought to protect the sleeper from acting out their dreams. During REM sleep, the body is paralyzed, except for the eyes and muscles used for breathing. It is believed to play an important role in learning and memory. REM sleep is a stage of sleep characterized by rapid eye movements and increased brain activity. At this stage, your brain waves slow down, including your heart rate and breathing.ĭeep sleep occurs in REM sleep.
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