REM Sleep, or Rapid Eye Movement sleep, is a unique phase of the sleep cycle characterized by quick movements of the eyes, increased brain activity, and vivid dreams. It typically occurs about 90 minutes after falling asleep and recurs several times throughout the night, with each period getting longer as sleep progresses. During REM Sleep, the body experiences temporary muscle paralysis, preventing individuals from acting out their dreams. This stage is essential for cognitive functions such as memory consolidation, learning, and emotional regulation, making it a vital component of overall sleep health.