How is that comfortable?

Ethan was taking forever to fall asleep at nap today. He kept talking to himself or kicking the wall - that lasted for about an hour and a half. But he never cried or whined to get out, so I let him play quietly. Then, I noticed I hadn't heard anything from him for a while, so I snuck back there to peek in. He is sound asleep, but he has his legs through the bars and floating off the mattress and his blanket is arched over his head. How is that even comfortable? His legs are hoovering. Oh well. He's still sound asleep at this moment. I wonder if his legs will be all tingly numb when he wakes up . . .