ANSWERS: 2
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it is thought to be a reaction that comes from the days when we (as primates) slept in the trees. supposedly it kept us from falling out of the tree.
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It's called a myoclonic jerk. Every body suffers them to some extent, and sometimes even when they're awake. It's just a random muscle spasm. There maybe some truth in theory about primates, although that is far from totally accepted in the scientific community.
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