"30 minute nap between classes" -- heh, that's not how I remember it :) I had one class right after lunch, on Special Relativity. I was interested in the subject (it was an elective), but the lecturer's voice was quite monotonous and I rarely stayed awake through the whole class...
In my case, it was Introduction to Computer Science - I slept through the entire class and still aced it, having been introduced to computer science in puberty - but it was right after lunch with the worst lecturer in the department.
