The goal of this clinical trial is to learn if combining suvorexant (a sleep medication) with a shorter form of prolonged exposure therapy called PE-PC works to treat PTSD symptoms and improve sleep in Veterans and military personnel with PTSD and insomnia, with and without mild-to-moderate traumatic brain injury (TBI). The main questions it aims to answer are:
Does suvorexant, when combined with PE-PC therapy, reduce PTSD symptoms more than PE-PC with a placebo (a look-alike substance that contains no drug)? Does suvorexant, when combined with PE-PC therapy, improve psychosocial and physical functioning more than PE-PC with a placebo?
Researchers will compare PE-PC combined with suvorexant to PE-PC combined with a placebo to see if adding suvorexant improves PTSD symptoms, sleep, and overall functioning in Veterans.
Participants will:
Receive weekly PE-PC therapy sessions for 8 weeks Take suvorexant (10-20 mg) or a placebo each night during the 8-week treatment period.
Complete repeated assessments of PTSD symptoms, sleep, and psychosocial and physical functioning throughout the study.