Dean almost jerks up all over again, caught off guard by his own sudden need to turn and look Lucifer in the eye. A rest? He's not entirely sure what that truly means - if Lucifer's going to let him sleep, if he's going to knock him out while he looms over him the way Cas does, or if he's about to leave and return months from now, like he said earlier. Dean can't read the answer to it in Lucifer's tone, not trying to wish for any particular outcome with the hopes that he'll earn it.

But he can fully agree with the fact that he'd like a break. Even if he's not entirely sure that he's capable of sleep.