Presentation (CTI)

OBJECTIVES: Adequate sleep is essential for adolescent health and development, yet many adolescents fail to meet recommended sleep durations. Understanding the factors associated with sufficient sleep can inform targeted health interventions. This study aimed to examine the associations between sleep duration and demographic characteristics, lifestyle behaviours, and screen time use among adolescents in Hong Kong.
METHODS: A cross-sectional survey was conducted in 2024 across 20 secondary schools in Hong Kong, involving 1,704 adolescents aged 11 to 19 years. Participants completed a self-administered questionnaire assessing sleep duration, self-perceived obesity status, demographic characteristics, socioeconomic status, dietary behaviours (including breakfast consumption and fruit/vegetable intake), physical activity, and screen time behaviours (including weekday use of television, electronic games, and social media). Sleep duration was categorized as sufficient (≥8 hours per night) or insufficient (<8 hours). Multivariable logistic regression analyses were conducted to identify factors associated with sufficient sleep.
RESULTS: Significant differences between the sufficient and insufficient sleep groups were found in age, gender, breakfast consumption, physical activity, weekday screen time behaviours, and self-perceived obesity status (p < 0.05). Adolescents aged 14 or above were less likely to achieve sufficient sleep (adjusted odds ratio[AOR] = 0.566, 95% confidence interval[CI]: 0.438-0.732, p < 0.001). Higher odds of sufficient sleep were found among males (AOR = 1.414, CI: 1.138-1.756, p = 0.002), those who consumed breakfast daily (AOR = 1.646, CI: 1.336-2.028, p < 0.001), and those with weekday TV (AOR = 1.316, CI: 1.055-1.642, p = 0.015) and social media use under two hours (AOR = 1.689, CI: 1.354-2.107, p < 0.001).
CONCLUSIONS: Older age, female gender, skipping breakfast, and prolonged weekday screen time were associated with insufficient sleep among Hong Kong adolescents. Public health strategies that promote regular breakfast consumption and limit screen time—particularly on weekdays—may help improve sleep duration in this population.