Progressive Muscle Relaxation
Progressive muscle relaxation (PMR) is a deep relaxation technique that has been effectively used to control stress and anxiety, relieve insomnia, and reduce symptoms of certain types of chronic pain. PMR is based upon the simple practice of tensing, or tightening, one muscle group at a time followed by a relaxation phase with release of the tension.
This site provides resources to help you get started using this effective technique.
You can learn more about PMR on these sites: