Nocturnal and early morning headaches.
D002940:Circadian Rhythm; D006261:Headache / Q000188:drug therapy / Q000503:physiopathology*; D006801:Humans; D012891:Sleep Apnea Syndromes / Q000503:physiopathology; D012894:Sleep Stages / Q000502:physiology*; D012893:Sleep Wake Disorders / Q000503:physiopathology