The sudden shaking while sleeping is like being scared due to abnormal neural regulation, which is commonly caused by sudden shock when you just fall asleep or sleep shallow, and the body shaking is considered to be related to lack of rest due to physical exertion, which may also be caused by calcium deficiency. 1, exertion: due to overexertion, lack of rest leads to mental tension and overexcitement, which can lead to temporary loss of brain inhibition and muscle twitching when falling asleep. It is recommended to pay more attention to rest and avoid overexertion before going to bed to effectively relieve the situation; 2, calcium deficiency: lack of calcium in the body may lead to increased neuromuscular excitability, causing muscle contraction twitching phenomenon, occasional shaking generally does not have too much impact on the body, can eat more milk, soy products and other foods to relieve, can also take calcium; 3, restless legs syndrome: mostly in At night during sleep or in a quiet state, both lower limbs appear strong desire to move, the patient may appear unconscious twitching and shaking performance while sleeping. Some patients may have difficulty falling asleep or wake up too many times during sleep. Patients are advised to seek medical treatment early, and at the same time to develop healthy habits and relax before going to bed, you can take a bath, massage, etc. to relax the tight state during the day. It should be noted that if patients often fall asleep and suddenly shake as if they were scared, they should go to the hospital for a timely examination, because some brain diseases such as cerebral hypoxia sequelae, encephalitis or degenerative brain diseases can also cause such symptoms, which need to be identified early to avoid delaying the disease.