This chapter will focus on addressing sleep disturbance within the context of cognitive processing therapy (CPT) for post-traumatic stress disorder (PTSD). Sleep impairments are a hallmark symptom of PTSD and have been shown to be refractory to trauma-focused treatments for PTSD. Although CPT can improve sleep impairment in PTSD clients, studies have consistently indicated while CPT improves sleep disturbance, too often sleep does not return to normal functional levels. As such, researchers have investigated sleep-focused treatments as a potential augmentation to CPT to improve sleep disturbance. This chapter will provide an overview of sleep disturbance within PTSD populations, review the existing evidence base in this area, and discuss relevant clinical approaches and implications to address sleep outcomes in PTSD patients. A detailed case example will illustrate techniques to address this comorbidity using CPT approaches while maintaining fidelity to CPT implementation.