REM sleep is sometimes called paradoxical sleep because the sleeper has no muscle tone and cannot move his or her body.

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REM sleep is called paradoxical sleep because, despite the brain being very active and dreams occurring, the body's muscles are in a state of paralysis (except for the muscles that control breathing and eye movements), not because the sleeper has no muscle tone and cannot move. This muscle paralysis is a natural protective mechanism to prevent the sleeper from acting out their dreams.

REM Sleep Is Sometimes Called Paradoxical Sleep Because the Sleeper