Uncomfortable
Dean kept turning from side to side. He slept in many cheap motels and uncomfortable beds, but this one was by far the worst. (Although Sam didn't seem to have the same problem, the lucky bastard.) By this point Dean was sure he would be more likely to fall asleep in the Impala's backseat, no matter how cramped it was (he's done it before, and maybe he's woken with his back sore, but at least he was SLEEPING). If not for the impending hunt the next day he would have long given up on sleep altogether and went to a bar somewhere. At least he would have some fun. As it is, he would have to keep trying.
A sudden noise made him rise his head.
"Hello Dean" came quietly from the darkness.
"Cas, is everything okay?" the hunter whispered back.
"Yes, I simply wished to check if you are well." a moment of silence passed.
"Dean, why aren't you sleeping? It is in my understanding that humans require sleep to function."
"Don't be a smart-ass Cas. If I could, I would be sleeping, but the damn mattress is too uncomfortable!" The hunter welcomed the chance to bitch to somebody. And, if nothing else, Cas was a good listener.
"I see, so if you had a different mattress, you would be able to rest?"
"Damn right I would! No chance for that tonight though." sighed Dean. Castiel analyzed the situation an replied: "I might be able to help."
"No, thanks, Cas, but in my experience angel-induced sleep is not very restful." Or maybe it was just a Zachariah thing. Either way, Dean didn't particularly want to test it tonight.
"I had something else in mind." Castiel laid his hand on the mattress. Almost instantly the hunter felt the difference.
"Wow, Cas... Didn't know angels could do things like that. You sure it won't upset the balance, or whatever?" The angel shrugged slightly. "It might have had if I changed it's structure. However I have just substituted it with a mattress from the last motel you stayed at. Don't worry, no one was sleeping on it."
Dean laughed quietly "You tricky angel! Thanks though, I really need to be ready for tomorrow."
"I know, Dean." Cas smiled lightly and took a step back from the bed. "I will leave you now. Goodnight." Dean heard the whispers of wings and a moment later the angel was gone. The hunter laid down with a sigh of pleasure (their previous motel was somewhat luxurious) and closed his eyes.
Meanwhile Sam slept on unawares. In the morning he will wake up well rested, but hurting all over, and bitch at his older brother relentlessly for having taken a better bed. Dean's mood will be all the better for it.
A/N: If there's someone out there who's seeing a ton of mistakes here (grammatical and structural and every other type as well) and would be willing to help, please write to me! I would like to get better, but I can't when I don't know what I'm doing wrong.