Optimization of an Online Stepwise Therapeutic Device Based on a Cognitive-behavioral Approach for Cancer Patients With Insomnia

Inclusion Criteria: * Adults patients, * With a diagnosis of localized or metastatic cancer, * During or after their treatment, * In one of the following three cancer centres: Gustave Roussy (Villejuif), Montpellier Cancer Institute (Montpellier), and Léon Bérard Center (Lyon) * With a significative score on the self-screening Insomnia Severity Index score (ISI ≥ 8) * Able to readily read and understand French, * Able to use informatic tools confidently and with Internet access, * Who have signed the online consent form, * Affiliated to a social security system or beneficiary of the same. Exclusion Criteria: * Patient with a visual, hearing or cognitive disability that is incompatible with the study, * Simultaneous participation in another study evaluating a treatment of insomnia, * Patient under guardianship or deprived of his liberty by a judicial or administrative decision or incapable of giving its consent.