title: [Sleep stages in premature children (electropolygraphic studies)].
mesh_terms: D002648:Child; D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature; D012894:Sleep Stages; D012895:Sleep, REM
vernacular_title: Evoliutsiia sna u nedonoshennykh deteĭ (elektropoligraficheski issledovaniia).