The goal of this randomized intervention trial is to determine the effect of bright light therapy on sleep disturbance, as well as to investigate the impacts of bright light therapy on biological age measured by clinical biomarkers. The main questions it aims to answer are: * Does bright light therapy improve sleep patterns (i.e., sleep onset latency, sleep disturbance, and sleep efficiency) in lung cancer patients? * Can bright light therapy slow the rate of aging measured by biological age in lung cancer patients? Researchers will compare bright light therapy group to control group to see if bright light works to reduce sleep disturbance and decelerate biological aging. Participants will: * Receive bright light exposure or usual light exposure every day for 4 weeks * Get blood draw at the baseline and at 4 weeks for clinical biomarkers tests * Complete self-reported sleep, fatigue and stress surveys at the baseline and at 4 weeks * Keep a daily sleep log