I'm participating in a story-a-day challenge from a Reddit writing group. My story is based on this prompt.
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Although there was nothing, there was a lot of it. Then some god or another popped in accidentally after drinking far too much on another plane of existence. Deciding that He had a throbbing headache and enjoyed the quiet, he went right to sleep, dreaming of whatever gods dream of.
What gods dream of, of course, is creation, and while he slept, he dreamt of a universe so vast that even He, a god, could find a quiet place to take a nap if He so chose, and gods, to be frank, quite often choose to take a nap. He dreamt of a funny little thing called a Human, and He found the Human so hilarious that he made other silly creatures to go with it: Dogs, Cats, Rhinoceri, and the like.
Unfortunately for the Humans, etc., what the god had drunk was a Hel-brew, a foul-smelling intoxicant brewed in the very pits of a dark, evil plane. The first and only ingredient was a large helping of the souls of the damned, tormented until they drowned in their own burning tears. It was quite delicious, very hearty, and had no side effects whatsoever except inebriation and the tremendous guilt one feels in drinking such a potable.
But our sleepy god also suffered from acid reflux, and His full belly began spurting stomach acid into His esophageal tract, causing an unpleasant burning sensation, which in turn caused Him to have bad dreams. And as I mentioned before, than meant that the entire Human experience of existence soon became a nightmare for the duration of His dreaming. The good news is that He is a light sleeper, and is expected to awaken in about 755 trillion years or so.