This is a hard one, I feel for you. Our little girl will be 3 in September. She has been not napping either. She'll stay up and then lately falls asleep around 5 then is up till like 10 or so....We are not early risers in our house but I think I need to start doing that. Maybe that would help you, too?
I have read in so many places that kids needs a daily nap until kindergarten. So I personally am going to try to institute a better routine.