Department of Defense PTSD Adaptive Platform Trial - Intervention C - Daridorexant

This study is part of a larger US Department of Defense trial testing treatments for PTSD (post-traumatic stress disorder) in military personnel and veterans. This specific arm is testing daridorexant — a sleep medication that works by blocking signals that keep the brain awake — to see if it helps with PTSD symptoms, particularly sleep disturbances. **You may be eligible if...** - You meet the general eligibility criteria for the master PTSD trial (NCT05422612), which typically includes being a military service member or veteran with a PTSD diagnosis - You have not previously been diagnosed with or treated for narcolepsy - You have never taken daridorexant before **You may NOT be eligible if...** - You have a history of narcolepsy - You have previously been treated with daridorexant - You do not meet the general criteria of the master PTSD trial Talk to your doctor to see if this trial is right for you.