Results of mixed model analyses showing within-subject associations between physical activity in the preceding day and sleep quantity and quality during the following night.

<p>All models are adjusted for sex, current BMI, age, socioeconomic status of the family, season, and history of any chronic disease.</p><p>*SD unit change refers to change in the dependent variable according to an increase of one standard deviation unit in the mean daytime physical activity.</p><p>95% CI refers to 95 percent Confidence Interval.