A headache after a long sleep can be relieved by opening windows for fresh air, taking a hot bath, doing outdoor activities, and medication. 1. Open the window to ventilate: sleeping for a long time headache may be related to the lack of air circulation, you can open the window to breathe fresh air, relieve the headache. 2. Take a hot bath: If sleeping too long causes headaches, you can take a hot bath to promote blood circulation throughout the body, thus relieving the symptoms of headaches. 3. Outdoor exercise: If you sleep too long and have a headache, you can improve your headache by doing outdoor exercise. Jogging, walking, bicycling and other aerobic exercise can be appropriate to relieve. 4. Medication: If the headache is more obvious, you can consider using diclofenac, ibuprofen and other drugs to relieve the symptoms. In order to avoid sleeping for a long time headache, you can make an alarm clock before going to bed to avoid sleeping too long, if the headache symptoms are not relieved for a long time, it is recommended to consult a doctor in time to avoid further aggravation of the condition.