The Social Gradient of Sleep in Adolescence: Results from the Youth@ Hordaland Survey Mari Hysing, Keith J. Petrie, Tormod Bøe, Tea Lallukka, Børge Sivertsen January 2016 Cite 🔍no doi found ⛔ no doi found Related The Strengths and Difficulties Questionnaire (SDQ): Factor Structure and Gender Equivalence in Norwegian Adolescents Childhood Sleep Problems and Familial Socioeconomic Status Parental Emotional Well-Being and Parenting Practices Mediate the Association between Ses and Mental Health Problems in Children Stability of Mental Health Problems across Middle Childhood — Results from the Bergen Child Study Delayed Sleep Phase Syndrome in Adolescents: Prevalence and Correlates in a Large Population Based Study