He thought to himself with some irony that at one point he would have had Delta set an alarm for him to wake up in six hours or so. Delta didn't have those abilities anymore, and of course it's something he'd been going without for several months now anyway, with the absence of his AI since his arrival here. Instead he contents himself with awakening whenever his body decides he's done resting, and in the meantime he'll try not to sleep too heavily, in case Delta does need him for something.