Association between short time in bed, health-risk behaviors and poor academic achievement among Norwegian adolescents

To investigate the prevalence of short time in bed (8h/day) and to examine the association between time in bed, overweight/obesity, health-risk behaviors and academic achievement in adolescents.This study included a sample of adolescents (n=2432) aged 15-17 years in the southern part of Norway (participation rate, 98.7%). A self-report questionnaire was used to assess time in bed, body mass index, dietary habits, physical activity habits, sedentary behavior, smoking and snuffing habits, and academic achievement.A total of 32.3% of the students reported short time in bed (8h/day) on an average school night. Several health-risk behaviors were associated with short sleep duration, including no…