Theres strong evidence that in puberty and adolescence the internal clock shifts to wanting to sleep and wake later, and it’s a bit of a struggle to get the body to work on the schedule schools force you to have.
There also may be a link with not being exposed to morning light( getting to school when it’s dark or just past sunrise and immediately into florescent lights) which makes it harder to sync with the early morning schedule.
So combine it not being a “natural” schedule while limiting access to the thing that would help switch to that schedule and you get sleeping in class and not being able to sleep at night.
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