title: [Occurrence and nature of sleep disorders].
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002648:Child; D004325:Dreams; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009031:Moscow; D012737:Sex Factors; D012893:Sleep Wake Disorders / Q000453:epidemiology*; D014937:Work
vernacular_title: K voprosu o rasprostranennosti i prirode rasstroĭstv sna.