Don't let them sleep too much, then they will be wide awake in the car! Oh, by the way, thought I would fill you in on my car game, it's called Blue Tarp.
You get 1 point for spotting a Blue Tarp.
You get 10 points for finding a Blue Tarp on a roof.
You get 20 points for finding a wooden cutout of an old lady bending over in someone's front yard.
You get 50 points for finding a car up on blocks with absolutely no tires & wheels!
Works great for those rural areas!