I was taking chemo treatments more than a year ago and the pain was excruciating...more than the surgery itself. So I had to take pain meds almost daily until about four months ago. One side effect was that I got some really way out there nightmares but some were realistic. Lately, I've been gaining weight but trying to not retain so much fluid. So I got water pills but they are giving me strange dreams. I only take one because I drink a lot of water and water-based foods. Besides going to the bathroom in the middle of the night, I can't sleep much. Lastly, when I take Cold-Eeze, I don't have this problem.