title: Causes of, therapies for insomnia, other sleep problems under study.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000375:Aging; D002648:Child; D006801:Humans; D008875:Middle Aged; D007319:Sleep Initiation and Maintenance Disorders / Q000209:etiology* / Q000628:therapy; D012893:Sleep Wake Disorders / Q000209:etiology* / Q000628:therapy