Brain infarction produces drowsiness is not a good phenomenon, drowsiness is a kind of disorder of consciousness, which is a symptom of pre-coma. If further aggravated, it can go into coma; further aggravated that is into mild coma, which can develop to moderate coma and severe coma, so the appearance of drowsiness is a manifestation of a more serious condition. Most patients have brain infarction because they have large infarct area and severe edema, which results in increased intracranial pressure and causes brain herniation formation; or brain infarction in critical areas, such as the brainstem, which affects the reticular superior activation system and causes patients to have arousal disorder and easily show symptoms of drowsiness or coma. Once the patient appears, he or she should immediately inform the doctor and ask him or her for further examination and, if necessary, to promote wakefulness and improve neurological function.