Jaden sleeping

I have a ton of pictures of my kids sleeping--I just think they sleep in the funniest ways/positions/etc. This is how Jaden sleeps for nearly every nap. He is nearly SITTING up or leaning up on his pillows. There is no LAYING down. I would think this would hurt his little neck! You can see---his pillow is vertical, not tilted. And, doesn't he look like he's thinking while he's sleeping!!