The problem is you don’t remove 8am classes, you reschedule them. And since prof time is a finite resource, they would now be at a new late time that could not actually be represented in the study. So is a new class later than the latest class better? I doubt it. I bet once you make 9am the earliest class now they will get up at 8:55 and be tired again.
It’s only hard to tell the new adult-children to go to bed earlier because they have lived their lives without ever being told to go to bed earlier.
I find HN, while progressive, is full of people who can’t function without their latte at 8am but enjoy living off the benefits of all the people that do have to get up early. Everyone at a coffee shop, people working 2nd and 3rd shifts, snow plow drivers, nurses, bus drivers, etc etc. A rule for me and a rule for thee I guess.