Dizziness and sleepiness may be caused by lack of sleep, acute upper respiratory tract infection, cerebrovascular disease, cervical spondylosis and other diseases, and it is necessary to improve the relevant examination to find out the cause of the disease and then treatment. 1. Lack of sleep: such as often staying up late, poor sleep quality, excessive use of the brain, etc., may cause dizziness and sleepy symptoms. 2. Acute upper respiratory tract infections: If there are symptoms of cold and fever, dizziness, headache, runny nose and other symptoms may appear. 3. Cerebrovascular disease: no matter ischemic cerebrovascular disease or hemorrhagic cerebrovascular disease, due to insufficient blood supply to the cerebrovascular vessels, it may cause symptoms of dizziness and drowsiness. You can check the cranial CT to confirm the diagnosis. 4. Cervical spondylosis: due to changes in the curvature of the cervical spine, resulting in the narrowing of the vertebral basilar artery, causing insufficient blood supply to the brain, and the symptoms of dizziness and drowsiness can occur. In short, the causes of dizziness and drowsiness are complex, and it is necessary to improve the examination and diagnosis in time, and treatment for the causes.