The phenomenon of headache when sleeping too long is mainly caused by the excessive sleep time. During sleep, the vagus nerve is in an excited state, the blood flow of the whole body is slow, the blood vessels of the whole body are in a dilated state, the blood vessels of the brain are also in a dilated state, sleeping too long will lead to a decrease in the blood supply to the brain, because the blood vessels of the brain are dilated and the blood flow is slow, resulting in the phenomenon of insufficient blood supply to the brain. As well as the long time of oxygen deprivation, patients will have headache symptoms. It is recommended that the patient’s sleep time should be adjusted appropriately, so that the best sleep time is when there is no headache after waking up.