Dean doesn't get nightmares. Okay, maybe he does. But he's totally fine after them... Okay, he isn't. It's nightmares of him in hell, getting tortured. His father being disappointed for breaking so easy. Maybe that's why in the middle of the night, he's suddenly crawled into your bed, arms wrapped around your waist. To feel better, to keep his mind off the nightmares. It's totally not also because he feels bad about how often he doesn't have time for you, when your both hunters. Totally.