Cognitive Behavioral Therapy and Light Therapy

In a single site, 3-arm (Cognitive Behavioral Therapy \[CBT-I\] group; Bright Light Therapy group; Standard of Care group), parallel, randomized controlled trial we will enroll 36 subjects (n=12 per group) to assess the feasibility of Bright Light Therapy compared to CBT-I in subjects with pulmonary arterial hypertension (PAH) to treat insomnia (difficulty initiating sleep or maintaining sleep) and fatigue. * To assess the recruitment and retention rates of CBT-I and Bright Light Therapy. * To compare the effects of CBT-I and Bright Light Therapy to Standard of Care on (insomnia and fatigue severity) and secondary (wake after sleep onset and sleep onset latency) outcomes. * To test the effects of CBT-I and Bright Light Therapy to Standard of Care on the secondary outcome physical activity. * To test the effects of CBT-I and Bright Light Therapy to Standard of Care on the secondary outcomes: depression, dyspnea and QOL.