I have a pre-teen, my goodness he's only 11, but my I've noticed a difference already. The silence, or - if I'm lucky - the occasional murmur in the morning, show the signs that this boy is not ready for school first thing in the morning. Having said that he does get himself up and dressed and fed (often force fed) in time, but it's not the tigger bounce in the morning of yesteryear!
So was very interested to watch on BBC the story of the school who have shifted the school time for teenagers to 1.30-7pm, and apparently making a whole lot of difference. The hormone changes in the hypothalamus means that them getting up at 8am (say) is the equivalent of an adult getting up at 4.30am every morning.
It's too early to check exam results, but by all accounts making for happier kids all around! I love this kind of stuff, and will be monitoring.
Having said that, Jasper is doing very well, as he's a conscientious kid (for the teachers), but still one to keep an eye on.
You can watch for yourself here!
Would welcome feedback from real parents with real teenagers, I am just a fledgling right now ;)