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STUDY OBJECTIVES To examine sleep patterns of adolescents attending school on alternating morning and afternoon schedules and to explore the contribution of sleep characteristics on the afternoon schedule to prediction of adolescents' daytime functioning. METHODS The Croatian adaptation of the School Sleep Habits Survey for a two-shift school system was completed by 2033 students (11-18 years old, 54% females) whose school start times alternated weekly between 0800 and 1400. RESULTS All age groups of adolescents reported delayed sleep when on the school wee