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What happens to your body during "dream sleep"?

Rapid Eye Movement (REM) sleep is when your body dreams the most. In this stage of sleep, your cardiovascular system seems to go through periods of dramatic acceleration and dramatic deceleration, very unpredictably.

During REM sleep, your brain also paralyzes your body so that your mind can dream safely, without worrying about your body doing something that would hurt you. Fascinating!

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