Aim 3: Evaluate improvements with respect to the process of therapy. Specifically, examine relationships between sleep improvement, PTSD symptom improvement, and the therapeutic elements (hypnosis, exposure, cognitive therapy) to determine mechanisms of action in the intervention. It is specifically hypothesized that improvements in sleep will be positively and temporally related to improvements in PTSD symptomatology throughout treatment. Further, overall decreases in sleep impairment will indicate a temporal, positive relationship to overall improvements in psychosocial functioning and health-related concerns.