That is not caused by different natural rhytme, that is caused by them not going to sleep till they are exhausted. It does not happen if they are not allowed to watch TV or browse the net or chat of social whatever and are sent to bed by parents.
That pop culture cliché also have only kids who don't give a fuck about anything doing that. And it is fuelled by it being perceived as cool. Overwhelming majority of students don't sleep during class.
I mentioned it because I was one of those kids. There was nothing "cool" about it, and I found my persistent insomnia, relative to high school schedules, frustrating at best. I got detentions several times for falling asleep in the middle of classes I personally found interesting.
I am pretty confident that that level of insomnia is not cause by normal teenager sleep patterns. If you can't sleep so much that you sleep in sch ool, then your problem is medical.
That pop culture cliché also have only kids who don't give a fuck about anything doing that. And it is fuelled by it being perceived as cool. Overwhelming majority of students don't sleep during class.