Snap that sass --- I feel like Cas learned to snap his fingers from watching humans, but Gabriel picked up his finger-snapping from his big brother back when things weren't so bad…And now I just feel awful. T.T
I'm going to ignore the actual caption and go with this instead... I think Dean arranged Sam to look like he was just sleeping. And Dean knew exactly what position Sam is usually in when he sleeps because he's Sam's big brother and he's been watching over him while he sleeps for his entire life.