Objective:Although the importance of sleep has been widely supported by empirical research, researchers have only recently linked sleep to children's social-emotional development. This study aimed to investigate 2 aspects of sleep - namely, sleep duration and bedtime routines - in relation to the social skills and problem behavior in a group of Chinese school-aged children.Method:This study involved 228 Chinese children (mean age = 8.32 years). Parents reported their child's sleep duration, the consistency of bedtime routines, and social-emotional functioning.Results:Both sleep duration and the consistency of bedtime routines had unique contributions to children's social-emotional functioning. Sex differences were found regarding the sleep-child adjustment link. Sleep duration was negatively associated with child problem behavior for both boys and girls. However, the relationship between bedtime routines and social skills was more pronounced for boys, while the relation between sleep duration and social skills was more evident for girls.Conclusion:Our findings highlight the importance of consistent bedtime routines and adequate sleep for the social-emotional development of Chinese school-aged children.