Why is your teen so tired?

Teens are notorious for wanting to stay up late and sleep in late. Find out what’s behind this behavior and how you can help your teen get better sleep — starting tonight.

A teen’s internal clock

Everyone has an internal clock that influences body temperature, sleep cycles, appetite and hormonal changes. The biological and psychological processes that follow the cycle of this 24-hour internal clock are called circadian rhythms. Puberty changes a teen’s internal clock, delaying the time he or she starts feeling sleepy and awakens.

Keep reading this article on Mayo Clinic.