Brainstem hemorrhage whose wakefulness depends mainly on the amount of hemorrhage. When the bleeding volume is relatively small, patients mainly show clinical signs of drowsiness and limb dysfunction. Usually they will wake up within a week, because the bleeding volume is relatively small and the impact on neurological function will be relatively small, so their waking time will be relatively early. If the bleeding volume is moderate, the patient will usually wake up in about three weeks. If the bleeding volume is greater than 10 ml, the patient basically has no possibility of waking up. In clinical practice, brainstem hemorrhage greater than 10 ml has a mortality rate close to 100%. The reason why a small amount of brainstem bleeding can also cause serious impairment of consciousness is mainly because the brainstem is the life center of the human body. If we compare a person to a house, the brainstem is equivalent to the foundation of the house, and a huge amount of bleeding means that the foundation of the house is shaken to prevent it from collapsing at any time, so the time of waking up is mainly based on the amount of bleeding.