I've posted this before, but it's relevant again:

My high school started at 7am. I also took the bus; which picked up around 6:15am; so I usually woke up around 5:45am during the week. I would often nod off during my first or second period; and routinely took 2-3 hour naps when I got home from school; which screwed up my ability to fall asleep early at night or get much homework done. I sometimes wonder what my academics would have been like if I was actually awake during those first two periods.

(This was in the 90's)