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