After sitting on the couch together for a little while, Crowley's eyes shut, his limbs relaxed, and his breathing slowed. He resorted to the state of what he believed he did best, sleep. He snored softly as he took long deep breaths, his stomach moving slowly up and down.
Aziraphale's mind was wrapped around his book. He was drawn away from it when he felt Crowley shift. His eyes trailed over the sleeping demon. He let out a soft chuckle at the comforting sight. Crowley's face twitched a bit. He shifted his position once again and leaned a little more towards the angel. He pulled the blanket further over himself, searching it for warmth.
Aziraphale finally set his book down. He sighed. He could've attempted to wake the demon or somehow attempted to bring him upstairs to his room and into bed. He thought for a moment, weighing his options.
Crowley was very comfortable in his position, his legs were stretched out, and his body was completely relaxed. He was pretty much dead weight, he wasn't moving anywhere anytime soon.
Perhaps sleeping on the couch tonight would do.
Aziraphale carefully pried the blanket slightly to join Crowley underneath it, his breathing hitching with hesitation. He didn't want to wake the demon. He soon found himself at ease and got comfortable. Crowley leaned into the new source of warmth and hummed with a comfortable, satisfied tone. Aziraphale had now wrapped himself in the blanket too. Relaxing, he laid his head on Crowley's shoulder.
The side of Crowley's head met the angel's soft hair as he planted it there, using Aziraphale's head as some sort. He curled up into the comforting feeling of it all. The angel's eye became heavy and eventually fluttered closed, and he fell victim to sleep.