Many people have the experience of headache after sleeping for too long, this situation is actually caused by the long sleep time. When people sleep, the vagus nerve is in a relatively excited state, and the breathing will become slower, so the concentration of carbon dioxide in the blood will rise. Dizziness and headache. Especially after waking up, the patient’s reaction will be slightly sluggish because the blood supply to the brain will be reduced when the blood vessels are dilated, so there will be a slight ischemia and hypoxia in the brain, and the performance will be mainly headache and dizziness.