If you wake up suddenly in the middle of the night while sleeping, there are usually several factors as follows: 1. Plant nerve dysfunction, when the rest and sleep state is not good, such as staying up late for a long time, mental tension, work and study pressure is huge. The deep sleep phase is shortened and the sleep phase is prolonged, so it is especially easy to be awakened during light sleep. 2, on the basis of the original disease, such as epilepsy, Parkinson’s disease patients are prone to sudden abnormal discharge of brain waves during sleep, so the patient will suddenly wake up in the middle of the night. 3, sleep apnea syndrome patients will also be in the middle of the night when sleeping, because the body lack of oxygen will suddenly wake up.