iCANSleep: Smartphone App-Based Insomnia Treatment for Cancer Survivors

Inclusion Criteria: * Cancer survivors * Over 18 years of age * Lives in Canada * Understands English or French fluently * DSM-5 diagnosis of insomnia * ISI score of 8 or higher * Good performance status as indicated by a score of 0-2 on the Eastern Cooperative Oncology Group (ECOG) performance status scale * Access to internet connection * Ownership of smartphone * Fluency using mobile applications. * Individuals with non-hematological malignancies must show no evidence of cancer or clinically stable/inactive disease for a minimum of 3 months prior to enrollment (for individuals with non-metastatic cancer) or be on a stable treatment regimen for the prior 3 months (for individuals with metastatic cancer) to ensure that insomnia is not a direct, acute response to cancer treatment. * Individuals with hematological malignancies must be in remission at the time of recruitment and have completed cancer treatments (e.g., transplant, chemotherapy, immunotherapy, radiotherapy) at least 3 months prior. Exclusion Criteria: * Presence of a sleep disorder other than insomnia that is not adequately treated (e.g., untreated sleep apnea) * Presence of a psychological disorder that is currently untreated or would impair the ability to participate (e.g., bipolar disorder) * Major sensory deficit (e.g., blindness) * Previous experience receiving CBT-I. * The use of medications prescribed for sleep (e.g., hypnotics, sedatives, or antidepressants) will be tracked and adjusted for in the statistical analysis.