Sleep restores your energy so that you can better manage pain. It also rests your joints to reduce pain and swelling. Most people need seven to nine hours of sleep per night. If you feel tired and achy after lunch every day, taking a brief nap (15 to 20 minutes) can help restore your energy and spirits. If you have trouble sleeping at night after an afternoon nap, try relaxing quietly instead.
(Source: Arthritis Foundation)