Understanding the effectiveness of Cognitive Behavioral Therapy for trauma-related insomnia (CBT-I) is important because sleep difficulties often persist after traditional post-trauma treatments are completed and other trauma-related symptoms have resolved. The objective of this study is to examine whether CBT-I will equivocally reduce problems falling and staying asleep (insomnia) related to military-related PTSD when administered in person versus through telephone therapy to veterans living in rural areas.