Postoperative neurocognitive disorders, including delirium and longer-term cognitive decline, are among the most common and costly complications of surgery in older adults, yet effective preventive strategies remain limited. Insomnia and sleep–circadian disruption are highly prevalent in this population, affecting up to one-third of older adults undergoing elective surgery and represent potentially modifiable risk factors that are rarely addressed in perioperative care. Cognitive Behavioural Therapy for Insomnia (CBT-I) is the first-line, evidence-based treatment for insomnia; however, its feasibility and efficacy have not been systematically evaluated for perioperative implementation. This protocol describes a pilot randomised controlled trial designed to evaluate the feasibility and acceptability of a condensed CBT-I intervention in the perioperative setting. The study will also explore its potential effects on insomnia and postoperative outcomes.

The SLEEP-BOOST study is a single-site, randomised controlled pilot trial conducted at Massachusetts General Hospital. The study will enrol 50 older adults (≥65 years) undergoing elective orthopaedic surgery with insomnia symptoms (Insomnia Severity Index≥10). Participants will be randomised 1:1 to either a condensed CBT-I intervention or a patient contact-matched Sleep Hygiene Education control group. All participants will complete 3 weeks of preoperative actigraphy and daily sleep diaries, with follow-up assessments at 2 weeks, 1 month and 3 months after surgery. The primary outcome is feasibility, assessed through adherence metrics, protocol engagement and acceptability. Secondary outcomes will be treated as exploratory including insomnia severity, sleep quality, actigraphy-derived sleep and circadian metrics, cognitive trajectories, postoperative pain, mood, functional status and incidence of postoperative neurocognitive disorders.

This protocol has received ethics approval from Massachusetts General Hospital Institutional Review Board (Protocol #2024P000780). Dissemination is expected to include peer-reviewed journal articles, reports, conference presentations as well as websites or social media platforms of relevant sleep treatment organisations. Participants will receive a summary of the study results.

NCT06375265.