A sudden jerk of the body during sleep is a normal physiological phenomenon. Our limbs are mainly controlled by the cerebral cortex, and when entering the sleep state, the cerebral cortex will inhibit the activities of the muscles of the limbs. But this time the muscle nerves will have some spontaneous movement, plus the sleep state, the body’s blood circulation is slower, the small muscle movement will be more obvious. So body shaking is a normal phenomenon, do not care too much, usually pay more attention to it, but also may be caused by a lack of calcium. If frequent, it is recommended to visit a hospital offline to clarify the cause and then give targeted treatment.