Woke up with a headache, activity for a while on the better because of the cardiovascular, cerebrovascular blood supply is insufficient to cause the brain cells lack of oxygen triggered by the symptoms. When people fall asleep, the heart and cerebral blood supply rate and blood flow rate according to the usual daily activities relatively slow, in the heart blood supply capacity and cerebral circulation ischemia in particular for patients with weak blood supply, and slow blood supply rate is relatively obvious, then the patient will be in the sleep of the cerebral circulation does not get enough oxygen supply. In the early stage of waking up, there will be obvious headache, dizziness, if suddenly stand up from the bed, there will also be a transient black haze, vertigo and sudden feeling, but after a while of normal activities, the heart and cerebral blood vessels to restore the normal blood supply, the blood oxygen saturation is gradually increased, the brain lack of oxygen symptoms gradually improve, and will gradually relieve. Regardless of the circumstances leading to the headache of waking up from sleep, it is recommended to check the cardiovascular and cerebrovascular system diseases in the hospital to avoid delays.