Depends on what one needs to do.
In agrarian societies it seems people have to get up early and start work early else the day gets too hot for outdoor work. So, circadian cycle or not, teenagers or not, you get up early else work does not get done.
For the most part we are not an agrarian society anymore but old habits mislabeled as virtue still telling us that getting up early is good. But more practically, we are limited by transportation and childcare. Grownups have to get to work, so children have to be dropped off (or at least picked up from the house) before grownups start working. For certain age range, school takes on the childcare function. Add transportation time and the desire to avoid adding more buses to “rush hour” and voila, school age children has to get up early and get onto school buses early, circadian rhythm be damned.
Local high schoolers (some of them, anyway) have been advocating for later school start time. They have been at it for years, but has yet to succeed. The pandemic has mixed things up a bit, showing us some alternatives. Maybe that will shake somethings loose for the high schooler’s plight. :man-shrugging:
