I agree that roll seems to be more frequent however, on my recent CPT~LHR, I was looking out of the window at the moon and stars and noticed the wing tip moving up and down against the clouds. I had not thought that we were rolling and I am usually very sensitive to attitude change.
So I looked in front of me and tried to sense the roll - I could not. So I looked out of the window and there was the slow roll and not just a wobble but a very distinct up and down of the winglet against a moonlit sky. I cannot say how many degrees as I have no scale of reference but DISTINCT and continuing.
Once again, I looked in front of me and could not see or sense the roll. I was at the leading edge of the wing in PE on a VS A346.