This is not as uncommon as you would hope. We have cut out a big swatch of mattress around a person who had been laying there so long the skin and fibers had intertwined.
Some of the ones who can still move somewhat, have a 5 gallon slop bucket beside the bed that they hit more or less, most of the time.
Sometimes I wish I was like a lizard, so that when I get back from one of those calls, I could just open my mouth and crawl out of my clothes, skin, and everything.
What I don’t understand is how anyone who might care for them can’t do something to intervene to try to save their lives.