Inclusion Criteria:  community-dwelling Veterans aged 18 years and older, received care from VAGLAHS in the prior year, live within a 50-mile radius of the research offices at the VA Sepulveda Ambulatory Care Center, have symptoms of PTSD, have symptoms of insomnia.  Exclusion Criteria:  current pregnancy or has a child less than 6 months of age (men and women), active substance users or in recovery with less than 90 days of sobriety, too ill to engage in the study procedures, unable to self-consent to participate, unstable housing (since we may not be able to retrieve costly and difficult to replace monitoring equipment), severe, untreated sleep disordered breathing (AHI>15 with excessive daytime sleepiness, or AHI>30), restless legs syndrome that accounts for the sleep disturbances reported, a circadian rhythm sleep disorder that accounts for the sleep disturbances reported (including shift work sleep disorder), unstable medical or psychiatric disorders (which is a contraindication for behavioral treatment of insomnia); remission of insomnia symptoms prior to randomization; current participation in prolonged exposure therapy for PTSD.