Check out example codes for "why do you jerk while falling aslee". It will help you in understanding the concepts better.

Code Example 1

Another popular idea takes a more evolutionary approach to hypnic jerks, explaining that the spasms are an ancient primate reflex to the relaxation of muscles during the onset of sleep — the brain essentially misinterprets the relaxation as a sign that the sleeping primate is falling out of a tree, and causes the

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