There is no exact figure for how long it takes to wake up from a 5ml coma from a brain stem hemorrhage. The brain stem includes three parts: the midbrain, the bridge, and the medulla oblongata. 1. Midbrain hemorrhage: midbrain hemorrhage 5ml, patients tend to be comatose, there may be one or both pupils dilated, need emergency craniotomy to remove hematoma and decompression of the bone flap treatment, postoperative enhancement of dehydration to reduce intracranial pressure, after active treatment, the patient can be gradually awakened. 2. Cerebral bridge hemorrhage: 5ml of bleeding from the cerebral bridge is a large amount of bleeding, the cerebral bridge is the control of the human consciousness center, it is difficult to wake up, and often prolonged coma, or even vegetative state of existence. 3. Medulla oblongata hemorrhage: since the medulla oblongata is the respiratory center of the human body, a large amount of medulla oblongata hemorrhage, the patient’s respiration is inhibited, and the patient faces the risk of death in a short period of time. Therefore, if you have brain stem hemorrhage, go to the hospital in time, check the CT of the head, clarify the location of brain stem hemorrhage and the amount of bleeding, and actively cooperate with the doctor’s treatment, so as to save the patient’s life to the greatest extent possible.