Unless there has been some sort of extenuating circumstance, Castiel does not generally required more than two to three nights worth of sleep in a week. As it stands, he's had none in almost six days. It's not just the losses, although they are difficult to bear, but the disturbance to his grace that keeps him awake. The more powerful live tremors in their absence and he'd known that someone powerful had been taken.

He is glad, when he hears her prayer, that it was not Rukia.

"Hello Rukia," he says, wings fluttering as he lands next to her, brow furrowing at the energy of this place.