Welcome to the home for our poster, "Longitudinal Associations Among Sleep Disturbance, PTSD Symptoms, Functional Impairment, and Quality of Life in Iraq and Afghanistan War Veterans". It was presented at the San Antonio Combat PTSD Conference, held on October 23–24, 2019. The webpage for the conference lives [here][1]. **Here is a summary of the poster presentation:** Among veterans with PTSD, sleep problems are reported the most frequently and with the highest severity. Moreover, these problems tend to linger after other PTSD symptoms have reduced and can hold patients back from making gains in treatment. There is one cross-sectional study that looked at how sleep problems and PTSD impact the quality of life (QOL) and functional impairment (FI) of veterans. Our research is the first longitudinal study to look at these four constructs together. Using data on OEF/OIF era veterans from Project SERVE’s Pilot and Phase 1 studies, we estimated four hierarchical models predicting QOL and FI at 4-months post baseline. Step 1 was always the baseline levels of the outcome variable, followed by PTSD severity in Step 2, and then our sleep variable in Step 3. All full models accounted for 60% or more of the variance in the outcome. Three of the four models were still statistically significant with the addition of sleep disturbance, with the R-squared change in those models ranging from 1%-4.7%. From this rigorous analysis we concluded that sleep disturbance had a residual impact on the quality of life and functional impairment of Veterans over time, after accounting for the baseline levels of our outcome and PTSD severity. This supports the use of combined treatments for PTSD and sleep disturbance to yield more improvement in quality of life and functioning. [1]: https://www.combatptsdconference.com/