Heh, I've fallen asleep plenty of times in school, or at least started nodding off. Most of it was during college though, where the professors didn't seem to care too much; and the one time I did it before then, it was in a high school class of mine where the only person who seemed to notice, or at least made mention of it, was the kid who sat next to me.
"Hey, do you realize you fell asleep yesterday?"
gee I had no idea thanks for telling me.
Anyway.
Most ridiculous place for me though would probably be my floor. On purpose. Because I could. Just give me a pillow or even just a blanket and I was golden. Actually I don't remember much of why, I think it might have had something to do with how long my headphone cord was and where that computer was and how it didn't quite reach to my bed even though my bed was right there and I wanted to listen to music while lying down doggonit! It's been enough years that I don't remember details.
I was pretty much able to fall asleep anywhere I wanted. Probably still can. Except on my desk. The way it's positioned, I really can't even rest my head on it without many problems. The chair I sit in though, that's another story...