title: Primary insomnia: a disorder of sleep, or primarily one of wakefulness?
authors: Jim
authors: J
authors: Horne
mesh_terms: D001143:Arousal / Q000502:physiology; D006970:Disorders of Excessive Somnolence / Q000453:epidemiology; D005221:Fatigue / Q000453:epidemiology; D006801:Humans; D012720:Severity of Illness Index; D007319:Sleep Initiation and Maintenance Disorders / Q000175:diagnosis* / Q000453:epidemiology; D014851:Wakefulness