The Effects of Treating Insomnia on Behavioral Weight Loss Outcomes in Survivors of Breast Cancer

This study is testing whether treating insomnia can improve weight loss outcomes in breast cancer survivors who are overweight. Researchers believe poor sleep may make it harder to lose weight after cancer treatment, and they want to see if addressing insomnia first leads to better results in a behavioral weight loss program. **You may be eligible if:** - You are a woman aged 18 or older - You have been diagnosed with ductal carcinoma in situ (DCIS) or stage I–III invasive breast cancer confirmed by biopsy, within the past 10 years - You have completed surgery, radiation, and planned chemotherapy or immunotherapy - Your BMI is 25 or higher and you weigh 400 lbs or less - You are willing to work toward losing 10% of your body weight **You may NOT be eligible if:** - You have not completed your planned cancer treatments - You have stage IV (metastatic) breast cancer - You are a man - Your current health does not support participation in an exercise or weight loss program Talk to your doctor to see if this trial is right for you.