Don't do this anon. Please, for the love of god, don't do it -- this is a dangerous and slippery slope. I used to do this for years thinking it was better than cooming, but it will only make the pain much worse and really fucks with your mind. You will become addicted to comfyness, which sounds great in theory, but in reality you will constantly be seeking a comatose, immobile state. You will become dull, empty of energy, and slothful in a way you cannot imagine. Eventually, you will realize the pillow isn't warm. The pillow isn't heavy enough. The pillow cannot hug you back. You will get a true understanding of what you can never have.
Please stop while you can -- it's a hole that's not easy to get out of.