Association of sleep timing and sleep variability with health-related outcomes in a sample of Brazilian adolescents.

Objectives: This cross-sectional study aimed to examine the relationships of sleep timing and sleep variability with depressive symptoms, health-related quality of life (HRQoL), daytime sleepiness, and body mass index (BMI) in adolescents.

Methods: Adolescents from three schools ( = 571, 56% female, 16.3 ± 1.