Ugh - yes first day back to school at our house today - so I completely sympathize...

The only thing that works for my kids is _lots_ of physical activity. It's really hard to fit it in on school days though. We are planning to try to get to the swimming pool as often as possible during the week - it seems to help.

Also, I find that waking them earlier seems to naturally lead to (slightly) earlier bed times, as annoying as that is to do.