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Figure 1. Sequential screening of subjects from initial pool of 2,091 Operation Iraqi Freedom/Operation Enduring Freedom (OIF/OEF) veterans to final study group of 63 veterans who had experienced at least one episode of combat mild traumatic brain injury (TBI) associated with loss of consciousness (LOC), neurological deficit (ND), and posttraumatic stress disorder (PTSD). Ruff RL, Riechers RG 2nd, Wang X-F, Piero T, Ruff SS. For veterans with mild traumatic brain injury, improved posttraumatic stress disorder severity and sleep correlated with symptomatic improvement. J Rehabil Res Dev. 2012;49(9):1305–20.http://dx.doi.org/10.1682/JRRD.2011.12.0251