From my experience on dive boats, I did notice that the medications that deaden your sense of motion (dramamine, scopolomine, etc) caused the worst falling injuries aboard, because once you realize you are falling, you are usually too far gone to catch yourself.
I think that on a pitching and listing sailboat, it could possibly be worse, especially with your focus on your insides and not around you.
I was also told that there are 2 kinds of people, those that get seasick
and those who will
get seasick, so be nice to those pondering water beneath the rails, especially if you haven't had your opportunity to feed the fishes yet.