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Hypnic jerk is a jerk that often occurs at the beginning of sleep and is accompanied by a feeling of falling and sometimes passed by almost all people. The reason is that the muscles begin to relax and move into a comfortable state which means getting into sleep. The brain recognizes the signs of relaxation and is misinterpreted as indicators of fall and sends signals to the muscles of the body to try to balance. This happens for a number of reasons including caffeine, anxiety, stress and stress, according to the American Academy of Sleep Medicine
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