title: [Lack of morning light delay sleep. Early school opening turns adolescents into night owls].
mesh_terms: D000293:Adolescent; D002648:Child; D002940:Circadian Rhythm; D005858:Germany; D006801:Humans; D017440:Photoperiod; D010789:Phototherapy / Q000451:nursing; D012892:Sleep Deprivation / Q000451:nursing* / Q000517:prevention & control / Q000523:psychology