Poor sleep patterns may increase the risk of several mental disorders among teens, or serve as markers for these problems, suggests a systematic investigation based on the National Comorbidity Survey Adolescent Supplement. The survey, which included 10,123 US adolescents aged 13 to 18 years, revealed the following results:

• Teens slept on average 7.72 hours per night during the week.
• They delayed bedtime by 1.81 hours on weekends and overslept by 1.17 hours, on average.
• Mood, anxiety, substance abuse, and behavioral disorders were associated with going to bed later during the week, shorter weeknight sleep duration, greater delays in getting to bed over the weekend, and weekend oversleep.