My car is like a drug..........

Every time we get into the car I play the count down game. How many minutes (sometimes seconds) it takes before my kids fall asleep. Ever since they were little if we went somewhere in the car they would fall asleep. Creighton is usually the first asleep and it usually happens before we get out of the neighborhood or parking lot. I don't know what it is about the car but the car is like a drug for my kids!