Patients who are dizzy and always want to sleep may be caused by the following: 1. Consider patients with cerebral atherosclerosis, insufficient blood supply to the brain, and blood in a high-fat, high-viscosity state, which can lead to ischemia and lack of oxygen in the patient’s brain cells, and patients will show dizziness, drowsiness, and always want to sleep. 2. This condition may be caused by physiological factors, such as patients often stay up late, lack of sleep, work is more stressful, and stress is relatively large. 3. Patients who are dizzy and always want to sleep may also be caused by diseases, such as hypertension, insufficient cardiac output, upright hypotension or drugs, cold, fever, and insufficient blood volume, all of which can cause patients to have dizziness and always want to sleep.