Cozy bedtime or crime scene photos?

So tonight, after several attempts to get them to go to sleep, we just left the little farts in their room. There was plenty of noise, but we figured they'd settle down eventually. After a while it got quiet. Too quiet. OK, that's not true. Just quiet enough. We figured they'd just gone to bed. On our way to bed, however, Steph looked in and found them like this. Sound asleep. We giggled quietly and grabbed the camera. They didn't stir even when we turned on the lights and got going with the flash. Please note the little waffle-marks on Chas' cheek from where he was sleeping on the foam play mat on the floor.

Steph says they are stubborn and they get it from me. I have no idea what she's talking about.