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I always wondered the same thing about this sleep-jerking stuff until I took psychology freshman year of college. It was then I found out your body actually paralyzes itself during the sleep process, and that sometimes if your brain overrides your need for sleep it will suddenly purge your muscles of the paralysis chemicals, causing the jerking reaction. I'm sure that's pretty much what all of those links said, but I'm a lazy American and I didn't feel like reading up on it more than I already have.
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werd.
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