RecruitingBehavioural interventionPiloting an Insomnia Treatment in Patients With Ulcerative ColitisThe goal of this clinical trial is to learn if telehealth-based Cognitive Behavioral Therapy for Insomnia (CBT-I) adapted for Ulcerative Colitis (UC) works to treat insomnia in adults with UC. The main questions it aims to answer are: * Is telehealth-based CBT-I adapted for UC feasible and acceptable to participants? * Does CBT-I for UC impact insomnia severity and sleep continuity? Participants will: * Answer questionnaires online before and after treatment * Complete an online daily sleep diary before, during, and after treatment * Participate in 5 telehealth treatment visits over 7-8 weeks * Participate in 5-10-minute phone calls between treatment visits