The headache at night may be related to overwork during the day, or it may be caused by high blood pressure and cluster headache. 1. Overwork: If the work during the day is too busy, especially those engaged in mental labor, due to excessive fatigue of the brain during the day, resulting in the brain nerves in a long time in a tense state, it is easy to cause headaches at night. This is a normal physiological phenomenon, through reasonable rest, is conducive to relief. 2. Hypertension: patients with a history of high blood pressure are prone to elevated blood pressure at night due to factors such as daytime exertion, which can lead to headaches every day at night. This is mainly due to the increase in blood pressure, resulting in increased pressure inside the cerebral blood vessels, caused by the formation of irritation to the meninges. 3. Cluster headache: the typical characteristic of this disease is that it occurs at regular intervals every day, and some patients may have an attack at night, which may show headache every day at night, and may be accompanied by orbital pain, conjunctival congestion and other manifestations. Headache every day at night may also be related to other factors, it is recommended to consult a doctor as soon as possible, through the improvement of relevant examinations, to confirm the diagnosis of the causative factors, and then be guided by the doctor to carry out treatment.