The goal of this clinical trial is to assess the efficacy of a digital behavioral therapy for insomnia (dBTi) in people with chronic low back pain and insomnia. The main question it aims to answer is whether a 3 week period of dBTi can improve pain-related interference 6 weeks from commencement. Researchers will compare the treatment (dBTi) to an active control (Sleep health education modules) to see if there is a significant difference in outcomes at baseline and end-of-study (6 weeks).