Sleep such as self-conscious discomfort, must move usually caused by the following factors: 1, such as calcium deficiency caused by sleep instability will appear in the hands and feet twitching, twitching and other clinical symptoms; 2, such as stroke or certain hereditary, metabolic diseases can also cause sleep discomfort, must move clinical symptoms; 3, such as cerebrovascular disease sequelae, for example, cerebral infarction or acute cerebral hemorrhage of the neurological dysfunction of the patient is not easy to quickly enter the Sleep phase will also appear around the body a small range of twitching; 4, normal people such as mental stress, subconscious mind and can not fully enter deep sleep, the cerebellum can not be fully sleep state, the order will also be subjected to the implementation of the unrestrained, there will be a short period of time of mild twitching.