This is a surefire sign that he is satisfied. This child who rarely naps these days is, asleep (albeit in the car) because he had the best morning ever. You can't beat playing with your best friend who not only knows how you play but has all the props needed to be the biggest baddest superhero around. They were so intense about every aspect of their play. It has been a long time since I experienced the intensity of "childs play"; the type of intensity that is so consuming it is hard to turn off. So its no wonder I find it hard to relate. I need to remember what play is and walk more often in his shoes.