A frequently-recurring headache type that often happens at the same time at night while people are sleeping (leading them to also being called ‘alarm clock headaches’). This headache pain then wakes people up, and can last from 15 minutes up to four hours after waking. It is not accompanied by any other characteristic associated symptoms. Hypnic headache is a chronic disorder with people experiencing headache on more than 10 days each month. Often these headaches respond very well to a shot of espresso before going to bed.
