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From the studies I've read, this seems to be the case across the entire school system, not just university. If anything, it might even affect K-12 even more, since, the younger we are, the more sleep we need.
Nevertheless, I had my most challenging class 8am my freshman year of college and yeah, can confirm—it was horrific.
In retrospect, maybe it didn't help that I was out partying til 3am every day too, but that's a different story... (Jp, I was actually very diligent about it, but still couldn't crack the formula. It was simply too early.)
For all of middle school, I would to wake up at 4:30 to catch the bus that arrived anytime between 5:30 and 6:25 to get to school at 7:15. And i wonder why my sleep is so fucked today, and why I was always too tired to focus on anything back then.