I don't, but if you're upstairs you'll notice the "inverted pendulum swaying effect" much more. I slightly prefer downstairs roomettes on Amtrak for this reason, even though they may be a bit noisier. It doesn't make me sick but it's distracting when I'm trying to sleep.
That's an American problem. The Amtrack sleeper I went on was much much more shaky than any of the trains I have been on in Europe or Asia (except for maybe a commuter train in Norway). I think it has something to do with running trains on rails with hundred year old wooden ties.
