I get that, but it depends on where I am sitting. If I sit on the couch, I get on the side where I can rest my right arm on the arm, or just put a pillow underneath it. I start too slouch alot, just to be able to rest it, and that makes it worse.
I have a great glider rocker and the arms are exactly the right height and width to support my arms. That is my favorite chair to knit in.