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REM sleep, or Rapid Eye Movement sleep, is a stage of sleep in which the eyes move rapidly and dreams occur. It is one of the five stages of sleep and lasts for 5-30 minutes at a time; however, it can occur multiple times during the night. REM sleep is important for the body to repair, restore, and consolidate memory. During REM sleep, the body undergoes several physiological changes that are essential for the restoration of the body.