Tyler's been an inconsistent napper since about 18 mo. That's just the way he is, and no adjustment in nap timing has made a difference. On the days that he doesn't nap, he's more than happy to hang out in his room talking to himself, and bedtime moves forward to make up for the lost nap. Ever since he started doing this, we've just let him be. If he chooses not to nap, that's fine. We figured it would be good to keep the habit of going to his room for quiet time every afternoon, and now that he's older, I'm glad we did. We keep books in there and he can spend an hour or 2 by himself recharging. Not as good as a nap, but better than nothing!