Sleep Treatment Education Program-1 (STEP-1)

Inclusion Criteria:

* Age 40-89
* History of a cancer diagnosis (except non-melanoma skin cancer) ≥ 1 year 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 ≥12
* Regular access to the internet on a daily basis
* Able to read and write in English

Exclusion Criteria:

* Survivors who report ever being diagnosed with Bipolar Disorder.
* Survivors who report ever being diagnosed with a Seizure Disorder or have experienced a seizure in the past 12 months.
* Intention to adjust (decrease or increase) use of any prescribed or over-the-counter medications taken to decrease insomnia during the study period.
* Survivors diagnosed with sleep apnea who have declined treatment or are not adherent with treatment (as assessed by screening questions, see Appendix A).
* Survivors with suspected sleep apnea who have not completed an evaluation by a sleep specialist (as assessed by screening questions, see Appendix A).
* Usual bedtime does not fall between 5:00 pm and 5:00 am.
* Employment that involves irregular sleep patterns, such as shift-work or frequent long-distance travel across time zones, or employment in a position that could impact public safety (such as air traffic-controller, operating heavy machinery)
* Any impairment (e.g., hearing, visual, cognitive) that interferes with the ability to complete all study procedures independently.
* Prior participation in a research study which provided an educational or behavioral intervention for insomnia.
* Prior participation in a behavioral treatment or patient education program for insomnia delivered at the Dana-Farber Cancer Institute, or at Boston Children's Hospital.
* Participation in behavioral or educational interventions for insomnia in the 2 years prior to enrollment. This includes in-person as well as synchronous and asynchronous online insomnia programs, but not independent use of books, workbooks or other written self-help materials addressing insomnia.