Too little sleep

Most teens need about eight to 10 hours of sleep a night on a regular basis to maintain optimal health and daytime alertness. But few teens actually get that much sleep regularly, thanks to early classes, homework, extracurricular activities, part-time jobs, social demands and screen time.

Regularly not getting enough sleep can have health consequences. Tired teens can find it difficult to concentrate and learn. Too little sleep can contribute to behavioral problems, moodiness and irritability. A sleep deficit also increases the risk of accidents, injuries, high blood pressure, obesity, diabetes and depression. It's also linked with an increased risk of self-harm, suicidal thoughts and suicide attempts.