Don't worry about the kids. We leave between 2am and 3am when we drive from Buffalo. The kids stay awake for maybe the first 15 minutes of the trip and then they sleep until about 8am. Even after waking up and eating breakfast, they usually are still pretty tired one the road and usually take a nap at some point during the remainder of the trip. Like someone else said, when they get restless find a rest stop and let them walk or stretch their legs. You will find they handle the trip a lot better than you think they will.