I had occasional vivid
bad dreams, but not every night, or even every week. I think they were worse near the end of treatment (36 weeks, INF and Riba).
I attributed it to high stress and anxiety. In the past, during stressful periods in my life, I have had pretty graphic, violent dreams.
My doc gave me sleeping pills right at the beginning of treatment - just in case. I don't weigh a lot, so I can get away with taking half a pill. That way I don't feel groggy the next morning.