A Cleveland Clinic study investigates the scientific reason why teens sleep late, reports KSFY.com.

As school approaches, many parents dread the thought of pulling their sleeping teens out of bed, but a new study shows just why teens have such a hard time getting up early in the morning.

According to a study at the Cleveland Clinic, teens’ bodies are wired to operate on a delayed sleep-wake cycle. This means biologically, their bodies want them to stay up and wake up late.

Teens require around nine hours of sleep.

Doctors say keeping their schedule free from non-essential activities, allowing enough time for homework and getting to bed earlier will help them get a healthy amount of shut-eye this school year.

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