The body responds to stress with muscle tension, which can cause pain or discomfort. Progressive muscle relaxation reduces muscle tension and general mental anxiety. Progressive muscle relaxation often helps people get to sleep.
You can use a prerecorded audiotape to help you go through all the muscle groups, or you can just learn the order of muscle groups and work through them from memory.
Progressive muscle relaxation is sometimes combined with meditation.
WebMD Medical Reference from Healthwise