RecruitingBehavioural interventionEvaluation of Cognitive Behavioral Therapy for Insomnia (CBT-I) in Individuals With Mild Traumatic Brain Injury (mTBI)This study will employ cognitive behavioral therapy for insomnia (CBT-I) among individuals with mild traumatic brain injury (mTBI) who experience sleep disturbances. The research aims to evaluate the effects of CBT-I on sleep, mTBI symptoms, and, in particular, the ability of individuals with mTBI to engage in their desired daily life activities. The main questions this study aims to answer are: 1. Does CBT-I positively impact symptoms of mTBI? 2. Does CBT-I improve functional performance in individuals with mTBI?