title: The mystery of muscle relaxation.
mesh_terms: D001007:Anxiety / Q000628:therapy*; D001676:Biofeedback, Psychology / Q000379:methods*; D004576:Electromyography; D006801:Humans; D009126:Muscle Relaxation / Q000502:physiology; D012064:Relaxation Therapy; D007319:Sleep Initiation and Maintenance Disorders / Q000628:therapy*