Sleep Treatment Education Program for Cancer Survivors: STEP-Together

Inclusion Criteria: * Age 18-89 * History of a cancer diagnosis (except non-melanoma skin cancer) ≥ 6 months prior * No active cancer therapy (excluding chemoprevention) in the past four months, and no further therapy planned. * Significant insomnia as evidenced by an Insomnia Severity Index score ≥ 8 * Regular access to the internet * Able to read and write in English Exclusion Criteria: * Usual bedtime does not fall between 5:00 pm and 5:00 am. * Employment in a position where falling asleep at work could impact public safety (such as air traffic-controller, operating heavy machinery). * Ever diagnosed with Bipolar Disorder or with Seizure Disorder, currently taking medications to prevent a seizure, or have experienced a seizure in the prior 12 months. * Any impairment (e.g., hearing, visual, cognitive) that interferes with the ability to complete all study procedures independently.