How is this comfortable?

Earlier this week, we put Aidan & Colin to bed listening to a book on CD. At some point, I heard Seamus head in to join them...but since he was being quiet, I let it go. (And hey - if he's not in my bed, I'm not complaining.) Joe went in to check on them, and we found them all in one bed, all tangled up. (Picture quality isn't great since these are from my camera phone.)