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To quantify school-age children’s sleep and parent-associated factors on weekdays and weekends in Singapore, and investigate school-related and parent-related factors associated with short sleep. In an online survey, 251 parents with a child aged 7–12 y in Singapore reported their child’s sleep duration and school start time. Parent-related factors including sleep hygiene (e.g., parent-set bedtime), sleep priority (the amount of sleep respondents allowed their children to trade for other activities), and both parents’ sleep durations, were also reported. The prevalence of short sleep among the children was 64.5% on weekdays and 19.5% on weekends. Children’s sleep duration increased from 8.42 h on weekdays to 9.45 h on weekends ( p  &lt; .001). Relative to weekdays, on weekends, parents showed similar increases in sleep durations ( p  &lt; .001), imposed poorer sleep hygiene on their children (reduced likelihood of setting bedtimes and increased pre-bedtime electronic device use;  p  &lt; .001), and allowed their children to trade more sleep for interacting with family and friends, social media, gaming, and TV / videos ( p  &lt; .001). Shorter sleep duration in children was significantly associated with earlier school start time ( B  = 0.80,  p  = .02) and poorer sleep hygiene on weekdays ( B  = 0.16,  p  &lt; .001), but lower sleep priority ( B  = 0.05,  p  = .002) and shorter parental sleep duration on weekends (maternal:  B  = 0.18,  p  &lt; .001, paternal:  B  = 0.17,  p  = .002). Delaying school start times may be effective in increasing school-age children’s sleep duration on weekdays, while family-based interventions designed to enhance sleep hygiene, priority of sleep over other activities, and parents’ sleep durations can benefit children’s sleep duration on both weekdays and weekends.

Short Sleep Duration in School-Age Children: Differential Factors on Weekdays and Weekends