You're doing so well. 11 more to go then it's done.
As for lukewarm black coffee, I did, I've also put herbal teas and black tea through mine, I just made sure I flushed the tube through with some warm water to prevent staining.
With my sleep I found the sofa gave me the best position and support for my head. I still get much sleep at night, so daily naps helped me through.