Taking off while the other occupants sleep

I think you have found a routine that will work for you and your family and you will refine it over the up coming trips. Maybe one of your kids will want to get up early to spend some time with Dad alone. What I did for years when the kids were small we drove to Fla to see family every year taking turns driving 4 hrs on and 4 hrs off with my wife. We would leave at 6:00 pm eat supper in the Hi top van (class B) and by 9:00 pm the kids were sleeping. I would sleep in the back with the kids while she drove and vice versa. Over time usually one of the kids would stay up with Mom or Dad and felt special doing that. Usually I would pull into a rest area about 4:00 am and sleep for 2 hrs, then drive until the kids would wake up, stop for breakfast at 8:00 am or so, then continue the 24 hr drive. Now that I am retired I don't mind spending 4 days of travel to make the trip because I have more than a two week vacation.