But if policies delay those early morning classes, won't those night-owls just go to bed even later? I have had the same trouble, but any effort to address that by not scheduling anything in the morning has only led to sleeping in even later. The internal clock just shifts to compensate.

Not sure how to address the night-owl phenomenon, but there seem to be people who have successfully converted from being a night-owl to an early riser. The only thing I have seen to help is sticking to a strict schedule.