We just got back from being out of town for a week, so nap times and bed times were all over the place. The first day when we were traveling he didn't nap (I know, it's weird he doesn't sleep in the car), and he was ok that day, not a nightmare like I feared he would be without a nap. But then today he managed a short nap in the car, but by BT he was a wreck. This week we'll try strict capping. I'll start with 1.5 hr and see where that gets us.