Associations of Screen Time with Bedtime, Sleep, and Physical Activity Among School-Aged Children in Riyadh: A Cross-Sectional Study

Background/Objectives: Evidence on screen use and sleep among younger children in the Middle East is limited. This study examined associations of screen time with bedtime, sleep duration, sleep quality, and physical activity among school-aged children in Riyadh, Saudi Arabia. Methods: In this cross-sectional study (September–October 2025), parents of 1208 children aged 4–15 years attending one private school completed an online survey. Associations were examined using chi-square tests, Goodman–Kruskal Gamma, and ordinal and binary logistic regression adjusted for age and sex. Results: The proportion going to bed at or after 22:00 rose from 7.4% among those with <1 h/day of screen time to 32.9% among those with >3 h/day, and the corresponding proportions not waking refreshed were 20.1% and 35.1%. Compared with >3 h/day, 1–2 h/day was associated with lower odds of late bedtime (odds ratio [OR] = 0.37, 95% confidence interval [CI] 0.23–0.62) and non-restorative sleep (OR = 0.48, 95% CI 0.32–0.72), and estimates were stable across sensitivity analyses. The unadjusted association with shorter sleep (Gamma = −0.336) was attenuated after adjustment for age, and screen time was not inversely associated with physical activity. Conclusions: Higher screen time was associated with later bedtimes and non-restorative sleep, but not with lower physical activity, suggesting that sleep-focused guidance on evening screen use merits evaluation in longitudinal and intervention studies.