Dizziness and sleepiness can be caused by sleep disorders, insufficient blood supply to the brain, high blood pressure, neurosis and other factors. 1. Sleep disorders: poor quality of sleep at night or insomnia, there will be dizziness and sleepiness during the daytime, and the symptoms of dizziness and dizziness can be improved after improving the quality of sleep. 2. Insufficient cerebral blood supply: for example, cerebral atherosclerosis, hyperlipidemia, etc., may lead to insufficient cerebral blood supply, so that the cerebral ischemia and lack of oxygen, and will often appear dizziness and sleepy symptoms. 3. Hypertension: When blood pressure increases, it may lead to expansion of cerebral blood vessels, which may lead to confusion and sleepiness, and may be accompanied by dizziness and swelling. 4. Neurosis: may be related to neurasthenia, anxiety and other factors, can lead to neurological disorders, nerve excitability and brain fatigue, will often appear confused and sleepy symptoms, will have a serious impact on the quality of life. The recurrence of the phenomenon of dizziness and sleepiness, it is recommended to consult a doctor for a detailed examination, to clarify the specific causes, and timely treatment.