Dizziness and sleepiness may be caused by insufficient blood supply to the brain. Patients with insufficient blood supply to the brain can cause ischemia and hypoxia to the brain, and lack of oxygen to the brain can cause patients to become sleepy and sleepy. Patients with insufficient blood supply to the vertebrobasilar artery can experience dizziness, nausea, and vomiting. At the same time, patients can develop balance disorders and ataxia. Insufficient blood supply to the brain can occur in middle-aged and elderly people, as well as in young people. In middle-aged and elderly patients, the main cause is due to atherosclerosis. Common causes of atherosclerosis include hyperlipidemia, hyperglycemia, hyperhomocysteinemia, and hypertension. The main cause of cerebral artery insufficiency in young people is due to mental stress, excessive stress, and poor sleep; it may also be caused by prolonged head-down reading of cell phones and playing with computers. In addition, it can also be seen in cervical spondylosis.