“…The Insomnia Severity Index (ISI; Bastien, Vallières, & Morin, 2001) is one of the most frequently used measures to assess the severity of and distress associated with insomnia symptoms in both general and clinical populations as well as in both civilian and military populations (Bryan, 2013; Jain, Mittal, Sharma, Sharma, & Gupta, 2014; Mollayeva et al, 2016; Spira, Lathan, Bleiberg, & Tsao, 2014; Sullivan, Berndt, Edmed, Smith, & Allan, 2016). Given the recognized importance of insomnia in TBI, the instrument has been increasingly used to study insomnia in Veterans who have sustained a TBI (Bryan, 2013; Spira et al, 2014).…”