i bought a stoma shield off the internet for £10. I use it for football but I don't think it would be good for sleeping as it does compress the bag a bit. I'm also a stomach sleeper. I find it helps...
I had subtotal colectomy on Dec 22nd last year (2013) I still have my rectum. I still get mucus and some blood but no urgency. I now ususally release it once every two days or so. its not a problem....