title: Study may explain why older people don't sleep well.
mesh_terms: D000367:Age Factors; D000368:Aged / Q000502:physiology*; D035843:Biomedical Research; D006304:Health Status; D006801:Humans; D012890:Sleep / Q000502:physiology*; D020178:Sleep Disorders, Circadian Rhythm / Q000175:diagnosis / Q000517:prevention & control*; D007319:Sleep Initiation and Maintenance Disorders / Q000175:diagnosis / Q000517:prevention & control*; D014851:Wakefulness / Q000502:physiology