Post Traumatic Stress Disorder [PTSD] is a mind/body illness diagnosed in military and civilian populations worldwide. It develops in the aftermath of many kinds of traumatic events including military combat, physical or sexual assault, and natural disaster. PTSD symptoms cluster into four separate categories: 1. recurrent distressing memories of the traumatic event, including nightmares and flashbacks; 2. avoidance of stimuli associated with the event, including physical environments, thoughts and emotions; 3. exaggerated negative beliefs and feelings about oneself, others and the world; and 4. a set of aversive physiologic states including hypervigilance, physical tension and disturbed sleep.