I am under the impression that even if you move the start times back eventually the teenagers would adopt to it and they would still have insufficient sleep. P

I am under the impression that even if you move the start times back eventually the teenagers would adopt to it and they would still have insufficient sleep. Perhaps school six days a week with shorter hours for more days per year? Or just full year schedules with shorter days as you increase in grade? Schools cannot adjust for the schedules of their students times simply because there are too many variances. Start times will simply be followed by changes where the advantage wanted gets lost