What's with the drowsy head?

Head drowsy, there may be excessive stay up late, tired excitement, vegetative nerve dysfunction, bad lifestyle, bad eating habits, long-term overtime play games, play mobile phones, deep sleep time less, excessive brain fatigue caused by visual fatigue, may also be hypertension, diabetes, hyperlipidemia and cerebral vasospasm, cerebral infarction, cerebral thrombosis vestibular neuritis, otitis media and other diseases caused. Brain disease itself can cause head drowsy, encephalitis, meningitis, intracranial occupation, tumor and other diseases, cervical spondylosis compression nerve, stimulate blood vessels, can also cause vertebrobasilar artery blood supply deficiency, causing head drowsy, it is recommended to further head CT examination.