Let me put it this way, by senior year I resorted to bringing a pillow with me to class. (Seriously)

Yeah, but I also worked 2 jobs and didn't Sleep a whole lot. But then maybe it had More to do with the copious amount of Pot I was smoking at the time.
Not really sure which.

Not in elementary or high school, but several times in college. I had one chemistry class that was right after lunch, and I fell asleep in class almost every day. The funniest part about it was looking at my notebook. The notes would start off neat and coherent, and within a few pages trail off into an incoherent illegible mess. By the end of class I would often still be moving the pen, but just scribbling incoherently while I dozed.

Way too many times to acknowledge!