I had some significant issues falling asleep after surgery, and if I did sleep I would have vivid dreams and wake up often. This went on for about six months, actually, and during that six months I started taking ambien, which would help as I would get 4-5 hours of sleep before waking. I also started taking lexapro for anxiety, which I don't think helped with the sleep but certainly did with other issues. At Thanksgiving time I had a week off of work and knew that I could deal with no sleep at night if needed, so I stopped taking ambien completely. The first few days were not fun, as I didn't sleep and forced myself to stay up during the day as much as I could. However, after that week I have only taken an ambien three times, and that was when we flew to Australia for a visit. To tell you the truth I am not sure what caused the sleeping issues, or why they stopped, but I am happy to say I don't have the problem anymore. For what it is worth, I was on metoprolol the entire time, and still am on the same dose. Not sure if I helped you out other than to give you my experiences, but there are my two cents.