Bright Light Therapy on Sleep Health in Lung Cancer Patients

This study tests bright light therapy — daily exposure to a special lamp that mimics sunlight — to improve sleep in people with lung cancer who have completed primary treatment and suffer from insomnia. **You may be eligible if...** - You are 18 years or older - You have been diagnosed with stage Ib to IIIb primary lung cancer - You finished your main cancer treatment at least 2 months ago (ongoing maintenance or immunotherapy is allowed) - You experience significant sleep problems (score of 8 or more on the Insomnia Severity Index) - You can read, speak, and understand English and are mentally able to consent **You may NOT be eligible if...** - You are pregnant - Your cancer has spread to distant organs (metastatic) - You are on supplemental oxygen - You have seasonal affective disorder, a substance use disorder, or a diagnosed sleep condition being treated (such as sleep apnea or narcolepsy) - You have recently done shift work or crossed more than 3 time zones in the past 2 weeks Talk to your doctor to see if this trial is right for you.