At 4 weeks I was on very little pain meds, usually the one before PT or my own morning workout. I found myself taking one before bed just to try and sleep not for pain. I still wasn't sleeping the best so I talked to my Dr and he prescribed Trazadone . It has helped, and he also prescribed me 4 Xanax to take in the beginning too so the cycle of not sleeping was broke. You NEED sleep to heal better and feel human during the day! I also had the intense burning at night. I was fortunate that a friend had TKR before me and gave me her BREG cooling machine. It's basically a small cooler that you fill with ice water and the pump continuously circulates cold water through the pad. I put the pad inside the pillow case I used between my knees and it worked to keep me cool all night. I hope you get some relief soon.