The main causes of sleepy headache are as follows: 1, lack of sleep, long-term insomnia patients or people who often stay up late, get up during the day will cause memory loss, drowsiness, sleepiness, headache and other symptoms related to lack of sleep. Usually improve the quality of sleep, the above discomfort can be relieved.2, acute upper respiratory tract infections, most of the viral infections are more common, can be divided into the common cold and influenza, influenza to the systemic symptoms, such as headache, fatigue, high fever, body aches and pains, etc..3, cerebral hemorrhage, cerebral hemorrhage caused by headache due to the increase in intracranial pressure caused by the cause of the headache, but also can cause dizziness, weakness, drowsiness, numbness of limbs, limb movement disorder and other symptoms. If middle-aged and old people have headache and drowsiness, it is better to check the blood pressure and observe for the time being, and if the symptoms are aggravated progressively, it is better to go to the hospital for consultation in time.