Hello and welcome to Mayo Connect. Sorry to hear that your sleep is being interrupted, but this is definitely a frequent complaint after joint surgery. We always want to believe we'll "bounce right back" but the truth is, joint surgery is a major assault on the body - bones, muscles, tendons, nerves and soft tissue are all involved. Each heals at its own pace, and each of us feels pain differently.

Two ways I found to ease pain after surgery are ice and Tylenol.
I used my Cryocuff ice machine close to 24 hours a dat for several weeks - even at night. And Tylenol extra strength on a regular schedule helped me stay ahead of the pain.
The other thing many people don't know is that the leg should be elevated whenever you are not "up and doing" - above the heart is best to keep swelling down and to keep the lymphatic fluids moving back toward the body (these carry away the by-products of healing), so add some pillows to the footrest, sofa and bed.
Have you been doing all of this already? If that is not enough, it may be time for a call to the doc for something a bit stronger, or a temporary sleep aid, to allow you to rest.
Sue