575 Sleep Duration in American Children with Autism Spectrum Disorder and the Role of Physical Activity

Introduction Sleep dysfunction is prevalent in autism spectrum disorder (ASD) and can have major daytime behavioral consequences. Emerging evidence suggests that physical activity may be associated with improved sleep in children, including those with ASD. We aimed to determine if there was an association between physical activity and sleep duration in American youth and if the association was consistent in children with and without ASD. Methods We analyzed data from children ages 6–17 years whose caregivers completed the 2018 National Survey of Children’s Health (N=20,980). ASD was self-reported (N=687), and we determined if reported ASD was mild, moderate, or severe, and if reported ASD occurred with intellectual disability (ID). Participants self-reported their weekday sleep duration and days of physical activity in the past week. We classified children as sleep sufficient or insufficient based on age-specific recommendations. Logistic regression was used to determine if physical activity and ASD were associated with sleep sufficiency. Physical activity-by-ASD interaction terms were used to determine if any physical activity association was modified by ASD status. Covariates included: age, sex, race, Hispanic ethnicity, highest caregiver education level, and overweight status. Results Compared to children without ASD, children with ASD were 29% less likely to have sufficient sleep (OR=0.71; 95% CI: 0.52–0.99), but this association attenuated to the null after adjusting for physical activity (OR=0.77; 95% CI: 0.55–1.07). Compared to zero days, being physically active for 1–3, 4–6 or 7 days in the past week was associated with increased odds of sufficient sleep, even with adjustment for ASD status (e.g., 4–6 days: OR=1.85; 95% CI: 1.48–2.32). We did not observe a statistically significant interaction between physical activity and ASD status with respect to sleep sufficiency (P-interaction=0.571), which remained consistent when using ASD severity and ASD with ID exposure variables. Conclusion Physical activity was associated with increased odds of meeting age-specific sleep duration recommendations in children with and without ASD. Our observations support pursuing physical activity in future studies as a potential intervention target to improve sleep duration in children, including those with ASD. Support (if any) NIH T32HL07713 and University of Pennsylvania’s Institute for Translational Medicine and Therapeutics