A substantial number of US Veterans are suffering from Posttraumatic Stress Disorder (PTSD) following deployment in recent military conflicts, and sleep disturbance is a primary complaint of Veterans presenting to the VA with PTSD. Veterans with PTSD have more self-reported and physician-rated health problems, and health status is associated with PTSD symptom severity. Most Veterans meeting criteria for PTSD report difficulty initiating or maintaining sleep (70-91%), and increased PTSD severity is associated with increased sleep disturbance. Even after receiving treatment for PTSD, Veterans continue to experience residual insomnia at a rate of about 50%, in spite of having achieved PTSD remission.