[Sam doesn't know why they do this every single night. They know each other well enough to know when they're really sleep and when they're faking, and Sam can't remember the last time he heard his brother's breathing even out into sleep. At this rate, they won't even die on the job. Their bodies will just shut down from lack of sleep.]

Dean.

[It's very quiet, giving his brother an out even now. Dean can ignore him and pretend to be asleep. But Sam needs to talk about this. Needs to get all this off his chest.]

I'm sorry about what happened. I know it made you uncomfortable, and I don't expect you to forgive me, but for what it's worth, I'm sorry.