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It's called a hypnagogic myoclonic twitch or "hypnic jerk". Nobody's sure why the body does this, but people think it may be because the muscles are relaxed, and the body misinterprets it as falling. It then sends signals to jerk you back up again! It's when your body is in a subconscious state, just before going to sleep.
Sometimes it may be because you are very tired, or trying not to go to sleep, but it is normal for it to happen.
-Meshkot Hassani THE GREAT!!!
Wiki User
∙ 11y ago
Wiki User
∙ 13y agoMaybe because of your dreams. And you dont always jump in your sleep, or remember your dreams, so i dont really know.
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