There are many causes of body shaking after falling asleep, and the common causes are mainly the following: first, hypocalcemia, low calcium tends to increase the sensitivity of nerve cells, which leads to leg and foot twitching symptoms, improve electrolyte examination can be clearly diagnosed, taking calcium carbonate chewable tablets can effectively control the onset of symptoms. Secondly, epilepsy, the disease is due to abnormal neuronal discharge, mainly manifested as limb convulsions, foaming at the mouth, limb straightening and other clinical manifestations, according to clinical symptoms and EEG examination can be clearly diagnosed. Thirdly, we should also pay attention to other aspects of the body examination, such as blood glucose, blood routine, to see if there is diabetes and anemia. Also pay attention to whether there is insomnia and dreaminess. Fourth, during sleep, especially during light sleep, there may be shaking of the limbs, which should be a normal phenomenon, should be considered sleep myoclonus, not a convulsion, sleep myoclonus does not require special treatment, temporary observation can be, of course, appropriate calcium supplements, appropriate more rest.