"Sam doesn’t sleep. Great. Hey, imagine what you can accomplish when you don’t need to sleep. But honestly, there’s no way Dean wouldn’t notice. They still sleep in the same motel room, don't they? So what is Sam doing during the night? Just lying in bed and comprehend that he sleeps? How boring. Or doing research? Or going out? And Dean with all his skilled hunter senses doesn’t notice? Everyone who believes this please raise their hand."