For example, for some brain tumor patients, if there is no impairment in the patient’s consciousness before surgery, the patient can wake up after the metabolism of anesthetics after surgery, usually within 6 hours after surgery. However, for patients with related intracranial complications, such as rebleeding and cerebral edema after surgery, it is not easy to judge the time of awakening. In the case of patients who are unconscious before surgery, such as those with severe brain hemorrhage or traumatic brain injury, it is possible that they may not wake up and be in a state of persistent coma after surgery; or they may wake up within 1 week after surgery, such as those with ventricular hemorrhage. Therefore, how long it takes to wake up from brain surgery depends mainly on the primary disease.