Circadian preference, sleep and daytime behaviour in adolescence

A total of 6631 Italian high-school students reported various sleep patterns and preferences.

• Evening-type adolescents had later bedtimes and wake-up times, particularly on weekends.
• These students experienced shorter sleep duration during the week and longer sleep on weekends.
• An irregular sleep-wake schedule and subjective reports of poor sleep quality were more common among evening-types.
• Daytime sleepiness, attention problems, and poor school performance were reported more frequently by evening-types.
• Evening-types also consumed more caffeine and substances for sleep compared to morning-types.

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