About 20 minutes into his nap, the kid started crying. Naptime is usually pretty easy. This business about how little kids don't understand they're tired was always mysterious to me. My parents told me that when I was a toddler, I alarmed them by vanishing, having wandered off all on my own to sack out somewhere quiet with a pillow. Much to my pride and relief, the kid is the same way-if I don't put him down for a nap, he'll climb into bed on his own or flop down on the floor with a blanket. When you're tired, you sleep. What's so hard to understand? READ MORE