Patients who fall asleep and suddenly become dizzy and want to vomit, mainly consider the following causes: 1. To be considered caused by cerebral vascular spasm, this category of patients mostly have diabetes, hypertension, hyperlipidemia, the presence of risk factors of cerebral atherosclerosis. When the patient’s blood vessels are spasming and the blood supply to the brain is insufficient, severe dizziness and vomiting will occur. If the patient walks unsteadily, has ataxia, or has numbness and weakness of one side of the limb, consider acute cerebrovascular disease, such as transient ischemic attack, cerebral infarction or cerebral hemorrhage, and make sure to consult a doctor promptly. 2. If the patient falls asleep and suddenly becomes dizzy and also wants to vomit, consider possible peripheral vertigo disease. If the patient has repeated episodes of dizziness accompanied by wanting to vomit, tinnitus, stuffy ears, and fluctuating hearing loss, consider it to be Meniere’s disease. If the patient has dizziness and vomiting during the change of head position that lasts no more than a minute, consider otoliths.