Inclusion Criteria:  Child aged 5-12 years, with a history of a cancer diagnosis (except non-melanoma skin cancer). No cancer therapy (excluding chemoprevention) in the past 6 months, and no further therapy planned. Child meets diagnostic criteria for insomnia disorder as determined by insomnia screening criteria (see Appendix A) Parent/guardian is able to read and write in English. Regular access to a computer/smartphone with internet access at home.  Exclusion Criteria:  Reports child has been diagnosed with a Seizure Disorder or has experienced a seizure in the past 12 months. Reports child has been diagnosed with a developmental disorder such as Autism Spectrum Disorder, Cerebral Palsy, Fragile X Syndrome, or Moderate to Profound Intellectual Disability. Reports child has been diagnosed with sleep apnea, and are not receiving recommended medical treatment for their sleep apnea. Intention to adjust (decrease or increase) child's use of any prescribed or over-the-counter sleep medications during the study period. Any impairment (e.g., hearing, visual, cognitive) that interferes with the parent/guardian's ability to complete all study procedures independently.