What causes it and what purpose does it serve the human body?
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Every night when you go to sleep, your body paralyzes itself so you don’t act out your dreams and hurt yourself — assuming you don’t have a sleep disorder, this is why sleepwalkers exist. Sometimes, your mind wakes up earlier than your body expects, so it’s still paralyzed. You might “hallucinate,” but that’s basically your brain continuing to dream even though you’re awake.
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