Likely comparable with some of the more suspect motels they had stayed in over the years. From Dean's perspective, his vision was blacking out, but he remained conscious enough to murmur a few quizzical sounds. He tried to help Sam but his body was too weary to do more than let his limbs dangle. Upon getting flopped into a bed, his eyes fluttered sightlessly before sliding closed again. His tired brain taking note of the prone position sent a signal to his body so he fell asleep quickly.