Digital Sleep Optimization for Brain Health Outcomes in Older Surgical Patients

Inclusion Criteria: 1. Adults ≥ 65 years old 2. Scheduled for an elective orthopedic total joint replacement procedure (knee/hip) 3. At least mild insomnia (ISI score of ≥10 on telephone screening or RedCap screening questionnaire) 5\. Own a smart phone 6. Willingness to use the dCBT-I app and actigraphy. Exclusion Criteria: 1. Current or previous CBT-I exposure in the last 6 months prior to the start of the study 2. Rapidly progressive illnesses/life expectancy \<6 months 3. Active psychosis/suicidal ideation 4. Irregular shift work/sleep patterns 5. Moderate-severe sleep apnea (apnea/hypopnea index ≥15) without CPAP compliance per chart review 6. Sleep disorders other than insomnia or apnea 7. Cognitive impairment (diagnosis of dementia) 8. Initiation, discontinuation, or dose change of sleep-affecting prescription medications within 1 month prior to study start or during the intervention period; not excluded if stable sleep-affecting medications in the prior month (by clinical review) 9. No surgery within 12 months of consented, eligibility will be reassessed if surgery is delayed by more than 3 months