My 2yo is a very happy soul. But wears herself out I think. She use to have two hour naps in the day and still sleep all night, but would wake up from the nap cranky.
She now doesn't have a nap and sleeps 7-6:30/7am. But is really moody from about 4pm. The dreaded time when your trying to cook dinner, and they are very irritable.
So nap= moody and no nap = moody.... Hmmmm