Cancer-related fatigue (CRF) and insomnia are prevalent among cancer patients and have been linked to decreases in quality of life and poorer overall survivorship. Currently, the mechanisms underlying CRF are not well understood, which has led to treatments that are only moderately effective. In addition, when compared to Cognitive Behavioral Therapy for Insomnia (CBT-I) in the general population, the treatment outcomes in CBT-I with cancer patients are subpar and, as such, this study will evaluate whether dose of CBT-I is effective in ameliorating CRF.