Sleep shivering is a sudden twitching of the body during sleep, medically known as sleep twitching. The activities of the body’s limbs and muscles are controlled by the cerebral cortex, and after sleep, most of the cerebral cortex enters a resting state, while some of the cerebral cortex is still in an excited state, which may cause a part of the body to twitch at this time. The common reason is that people are overworked, nervous, or under psychological stress, which leads to excitement in the cerebral cortex and causes involuntary twitching of the body during sleep, sometimes in the form of blinking, tilting the mouth, and shrugging the shoulders. So most of the sleep twitching is caused by psychological reasons, you need to learn to release stress, combine work and rest, and improve the quality of sleep. There are also some people who may have muscle twitching due to calcium deficiency, commonly seen in teenagers, and the symptoms can disappear after calcium supplementation.