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When sleeping, the muscles in your arms and legs are actually paralyzed because if they weren't you would actually end up acting out all your dreams. You may feel like you're "dropping" because you have woken up before the paralysis in your muscle has disappeared. Basically, your muscles are coming back to life while you're aware of it which is why you feel a twitch. You tend to feel that the twitch woke you up, however, it is actually the other way round - you have woken up, and then moved.

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15y ago

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