I heard on the news today that the schools in the city will be standardizing their opening times (I guess before it kind of varied), and one of the changes will be that Jr high will start later than the elementaries will, to 'accomodate the needs of students'. I'm assuming that this is in response to all the studies regarding the waking/sleeping time of teenagers vs. adults in an industrialized society.
If the funding was available, I would have schools operate on a morning and an afternoon schedule, so if ou were a morning person, you could go to the morning session, and vice versa. DeVry does this for their students.