Castiel ponders why God sleeps...
Castiel watched the steady rise and fall of God's chest. Her eyes were closed over her exuberant eyes, and her face was relaxed and innocent. She did not sleep like Sam and Dean did. Sam always slept on his stomach with one arm dangling off the side, while Dean slept with his limbs spread wide and his sheets wrapped around his middle. God slept with her arms at her sides and her legs straight. She never moved or spoke like Sam and Dean did, either.
Castiel did not sleep, and did not understand what the humans saw in it. To him, turning off your body sounded like a terrible idea. You could not stop someone from destroying you if you were unconscious. Luckily, he was there to watch over the three who chose to succumb to the odd habit.
He had seen God sleep many times by now. Surely she did not need it, like Sam and Dean assumed they did. He'd occasionally wondered why she did. However, the question slipped his mind by the time the three woke, and God could not read his thoughts and see that he was holding a question back while she was asleep.
Despite the fact that he thought it unwise, he enjoyed viewing the three. On occasion, he would take a look and see what Sam and Dean dreamed of. It was often something horrific, though he'd see a memory every now and then. He didn't dare enter God's mind, though. It would be disrespectful to do so without her permission.
Castiel adjusted himself in his chair, and continued to watch her for the rest of the night, wondering what sort of things God – creator of all – dreamed of.