Sudden shaking of the child’s body during sleep may be caused by external environmental stimuli, vitamin D and calcium deficiency, or incomplete development of the nervous system. 1. External environmental stimuli: mainly caused by sound, light, environment and other issues, when the child falls asleep suddenly sound or light will stimulate the child and cause sudden shaking while falling asleep. 2. Lack of vitamin D and calcium: lack of vitamin D and calcium may lead to rickets, causing increased excitability of the cerebral cortex leading to sudden shaking after sleep. 3. Incomplete development of the nervous system: Incomplete development of the nervous system leads to the lack of coordination between the excitatory and inhibitory functions of the nerves, which are easily excited. The slightest external stimulus will cause the nervous system to become excited and cause the child to suddenly shake. Sudden shaking of the body when the child sleeps may also have other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.