0049 Screen time and sleep in young adolescents before and across the first year of the COVID-19 pandemic

Abstract Introduction The COVID-19 pandemic has been associated with profound biopsychosocial changes for children, potentially affecting their health and wellbeing. Among these are altered sleep patterns screen time use, however, no work examined interactions between two behaviors in the context of pandemic. Here, we used longitudinal data from Adolescent Brain Cognitive Development (ABCD) Study® to investigate both time, relationship, before across first year young adolescents. Methods More than 5000 adolescents (11-14 years; 48% girls) completed digital surveys about daily use six timepoints during 2020-2021, as part ongoing ABCD Study®. Random intercept linear mixed effect models (LMMs) were examine associations bedtime, wake-up (social media, gaming), considering age, sex, school effects. Results Adolescents’ wake up was delayed (R2 = 0.51; ~1.5 hour) May-August 2020 relative pre-pandemic assessment (p<0.01), which partially related summer break advancing earlier times October 2020. Bedtimes also at all assessments (R2=0.62; ~1 hour), even after starting new particularly older (p<0.01) girls (p<0.01). Recreational dramatically higher pandemic, (p<0.01; ~45min social ~20min video gaming). spent activities later bedtimes effects being evident male female Conclusion Our findings show timing adolescents, critically, that excessive negatively impacts sleep. As increasingly turn more usage, highlight need promote balanced informed media platforms, games, other technology ensure adequate opportunity maintain healthy this critical period developmental change. Support (If Any) NIH U01DA041022