I have just had knee replacement surgery 3 weeks ago and have been trying to ween myself off my pain medicine (oxycodon acetaminophen) but I am having trouble sleeping at night. Is there anything I can take to help? I am uncomfortable in my hip as well as my knee and the only comfort I can find is walking through our house, using a walker, all through the night. It is not as bad in the day time. I was taking 1 tablet every 4 hours but I was going 5-7 hours between doses.