Insomnia may lead to depression later in life.
D000328:Adult; D003866:Depressive Disorder / Q000209:etiology* / Q000628:therapy; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D010342:Patient Acceptance of Health Care; D012306:Risk; D007319:Sleep Initiation and Maintenance Disorders / Q000150:complications*