For the identification of coma and sleep, the methods are as follows: First, whether the patient can be awakened: coma is a patient in a lifelong sleep state, can be awakened, can answer some questions after awakening, and then go back to sleep after answering. Patients in coma cannot be awakened and only have retracted responses to other strong stimuli such as pain, such as pressure orbits with painful expressions, or limb retracted responses. Second, the state of consciousness: patients in a coma generally have stable vital signs, and patients in a coma, especially those in a severe coma, have unstable vital signs. Therefore, sleep and coma are mainly identified based on whether the patient can be awakened, and the state of consciousness.