Initial Study of Insomnia/Nightmare Group Treatment for Posttraumatic Stress Disorder (PTSD)

Inclusion Criteria: * Must be enrolled in the Michael E. DeBakey VAMC Trauma Recovery Program and qualify for a diagnosis of combat-related PTSD related to service in Vietnam-era conflicts as measured by responses to the Clinician-Administered PTSD Scale (CAPS) and total score ≥ 50 on the Posttraumatic Stress Disorder Checklist Stressor Specific Version (PCL-S) * Have a clinically significant sleep problem as measured by a total score \> 5 on the Pittsburgh Sleep Quality Index (PSQI) * Have a repetitive trauma-related nightmare at least once per week on average, as measured by the Nightmare Frequency Questionnaire (NFQ), and which significantly impairs sleep as measured by response ≥ 2 on question 1a of the Nightmare Effects Survey (NES) * Be stable on current regimen of psychotropic medication (i.e., no changes to medications and/or dosages) if applicable * Must sign consent to be audio-recorded as part of the course of the treatment Exclusion Criteria: * Current substance dependence * Planned or ongoing participation in Prolonged Exposure or Cognitive Processing Therapy during treatment participation * Organic psychosis * Bipolar I disorder * Epilepsy * Currently on benzodiazepine or hypnotic medication to treat sleep * Currently take prazosin * Indication of undiagnosed sleep apnea defined as score ≥ .5 across items 1, 5, and 8 of the Multivariable Apnea Risk Index * Uncontrolled sleep apnea