The bane of the late-riser.... 8:30 classes! I used to hate them, even though I had to wake up at 5:30 AM, anyway.
I never drank coffee either, so I was pretty sleepy in those initial hours. I couldn't really understand those of you who intentionally chose early classes, or really late classes. Unless, of course, you worked.
Students in pajamas were a common enough occurence in my really large classes.