"Metamorphosis" by Franz Kafka

That's right. It's the original, disturbing, strangely humorous tale of a young man who wakes up and finds himself transformed into a cockroach. Franz Kafka's Metamorphosis is one of those undisputed classics of modern literature that you simply cannot escape; it's a must-read. If you have not yet had the pleasure of diving into this yarn, now is a great time to check it out and come discuss it with your fellow readers. At ~22k+ words it is more of a novella than short story, but still quite easily consumed over one or two sippings.

You can read the full text of the story here: https://gutenberg.org/ebooks/5200