Dean is full of food and alcohol and after today is just generally exhausted, so he blinks his eyes closed and drops off quickly. He wasn't entirely truthful when he said he doesn't dream when he's sharing space with Cas. He still dreams, they're just fuzzier, more distant. And not nightmares, which is a pretty damn big improvemet. Sure, some of them get a little uncomfortable at points, but he's not waking up screaming or breathless or in tears. Good enough.

At some point in the night, he shifts onto his side, mindful of his arm even when asleep, and pulls Cas closer, tucking his face into his neck.

Oh yeah. It's good to be Dean.