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Background: Sleep deprivation is a prevalent problem among adolescents which is closely related to various adverse outcomes. The lack of efficacy of current sleep education programs among adolescents argues for the need to refine the content and format of the intervention. This study aimed to evaluate the effectiveness of a group-based sleep intervention using motivational interviewing plus text reminders in changing adolescent sleep habits., Methods: This study is a randomized controlled trial comparing motivational group-based sleep intervention with nonactive control group. The primary outcomes were the sleep-wake patterns measured by both sleep diary and actigraphy at postintervention, 3 and 6 months after the intervention. The trial was registered with the Clinical Trial Registry (NCT03614572)., Results: A total of 203 adolescents with school day sleep duration of <7 hr (mean age: 15.9 ± 1.0 years; males: 39.9%) were included in the final analysis. Sleep diary and actigraphy data both showed that adolescents in the intervention group had earlier weekday bedtime at postintervention (sleep diary: estimated mean difference: 33.55 min, p = .002; actigraphy: 33.02 min, p = .009) and later wake-up time at 3-month follow-up compared to the control group (sleep diary: -28.85 min, p = .003; actigraphy: -30.03 min, p = .01), and the changes in diary measured weekday bedtime were sustained up to 6-month follow-up. In addition, adolescents in the intervention group had longer sleep diary reported weekday sleep duration at 3- (35.26 min, p = .003) and 6-month follow-up (28.32 min, p = .03) than the controls. Adolescents in the intervention group also reported improved daytime alertness postintervention, which was maintained at the 6-month follow-up., Conclusions: The motivational group-based sleep intervention is effective in advancing bedtime with improved sleep duration and daytime alertness in sleep-deprived adolescents., (© 2025 The Author(s). Journal of Child Psychology and Psychiatry published by John Wiley & Sons Ltd on behalf of Association for Child and Adolescent Mental Health.)