Dean looped his arm around Sam as his brother curled up against his side. He didn't want to even imagine waking up to find Sam dead beside him, because that would mean he wasn't really there with him until the end, so he wouldn't sleep well, if at all, tonight. Knowing Sam was alive was enough to give up a few hours sleep for.
"Right, yeah," he agreed in a faint voice, just above a whisper. They were never okay, they wouldn't be this time, but he was just beginning to really let that sink in. He'd keep on looking after Sam but he wasn't going to kid himself.
"I told you to go to sleep like fifty times, so go to sleep, Sammy," he insisted, kissing his head.