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Posttraumatic Stress Disorder is a significant or extreme emotional or psychological response to a shocking, dangerous, or traumatic event. Researchers discussed PTSD studies on sleep patterns and biomarkers at the Military Health System Research Symposium in Kissimmee, Florida. (U.S. Air Force photo by Senior Airman Christian Clausen/Released)

Posttraumatic Stress Disorder is a significant or extreme emotional or psychological response to a shocking, dangerous, or traumatic event. Researchers discussed PTSD studies on sleep patterns and biomarkers at the Military Health System Research Symposium in Kissimmee, Florida. (U.S. Air Force photo by Senior Airman Christian Clausen/Released)

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