Here is what I see the problem as.
Any day that you do not have any academic activities, you have 10 hours of sleep, and 14 hours of free time. Obviously a comfortable amount of sleep is subjective but we are assuming 10 is what we prefer.
Now, on a day of academic activity, we are going to have 12 hours of school related activity, leaving 12 for either sleep or free time. Being used to the break period, we want to have 14 hours but this is physically impossible. We finally go to sleep at the point where the marginal benefit from having an extra hour of free time becomes equal to the marginal cost from losing an hour of sleep.
Ultimately, your 14-hour-of-free-time-conditioned brain wants us to spend a lot of that time on whatever we want instead of sleeping, unless you are XavierEXE of course. This isn't the fault of the people scheduling school days, its the fault of the student.
I do see some obvious ways to fix this, though.
One is to regulate hours of sleep on a strict schedule. An example of this would be using terrarasque tranquizer darts to knock yourself out.
Another is to decrease free time throughout the year and have less long breaks, so we don't hunger for 14 hours of precious free time, instead we are used to having only 4 or 6 or whatever.
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