How long it takes to wake up after craniotomy for brain hemorrhage is related to a variety of factors, such as the severity of preoperative disease and the time to metabolize anesthetic drugs. Patients may be able to wake up within 24 hours after surgery or 2-3 weeks, while patients with brain herniation are less likely to wake up and may even be in a vegetative state for a long time. If the patient has a small amount of bleeding before the surgery and is conscious, after the effect of anesthesia wears off after craniotomy for brain hemorrhage, he can usually wake up within 24 hours after the surgery, and there will be some individual differences in the specific time. However, after waking up, the patient may be sleepy and go to sleep again because the anesthetic drug is not completely metabolized. If a patient with cerebral hemorrhage does craniotomy with a large amount of bleeding or causes brain herniation, which endangers the patient’s life, this part of the patient may first appear drowsy and then drowsy after the cerebral hemorrhage, and the disease continues to develop with coma, and the patient will also have unequal pupil size on both sides. This part of patients need a process to wake up after surgery, and will not wake up within a short time after the anesthesia disappears. If the surgery is done before the brain herniation occurs, the brain herniation can be avoided in time, and after the surgery, as the hematoma is cleared and the brain cell edema slowly recovers, the patient can usually wake up after 2-3 weeks. If the surgery is done late, after the brain herniation has occurred, or if the surgery is less successful and serious complications occur after the surgery, the patient is less likely to wake up and may even be in a vegetative state for a long time.