Teenagers need 11am lie-in

The initial research is a few years old now, but more recent classroom research has borne it out and one school is taking action on it. "... research carried out by Professor Foster showed that, from the age of 10, our internal body clocks shift, so it's good for young people to stay in bed. They peak at 20 then gradually go back again, but body clocks do not reach the pre-teenage level until around 55 years old. The 'time shift' is two hours on average, so teenagers should get up two hours later. We are making teenagers ratty by making them get up early."
While I'm quite willing to believe this, what I don't get is how this relates to our ability to shift our body clocks when we travel to different time zones. I presume that perhaps it's to do with how the body regulates the sleep hormone in relation to daylight. It would also explain how come evening services are a better bet for teens and twenties than morning. You see? We knew it all along!
Teenage pupils deserve 11am lie-in, says head | Education | The Observer: