Rose S, Boucher SE, Galland BC, et al. - In the present study, the researchers sought to compare self-reported sleep timing, quality, and duration in youth with high-risk type 1 diabetes mellitus (T1D) and controls without diabetes, as well as to compare these groups on objectively measured sleep timing, duration, and indicators of sleep quality to explore any differences between the groups. A total of 230 youth (13–20 years) took part in the two concurrent studies; 64 youth with T1D (mean age 16.6 ± 2.1 years, 48% female, diabetes duration 7.5 ± 3.8 years, HbA1c 96 ± 18.0 mmol/mol [10.9 ± 1.7%]) and enrolled in the Flash study, and 166 controls (mean age 15.3 ± 1.5, 58% female) enrolled in the SNAP IT study. Sleep problems are common in adolescents with high-risk T1D, with later bedtimes contributing to the sleep deficit. Despite the lack of objective differences, they believe their sleep quality is worse than that of their peers who do not have diabetes.