Sleep Hygiene Education Helps Insomnia But Falls Short of CBT-I

Insomnia affects a substantial portion of the global adult population and is closely linked to cardiovascular disease, metabolic dysfunction, cognitive decline, and reduced longevity. Non-pharmacological approaches are preferred for long-term management, making it critical to understand which interventions actually work. Sleep hygiene education — advice on behaviors like consistent sleep schedules, limiting caffeine, and reducing screen time — is widely recommended, yet its standalone efficacy has remained unclear.

Researchers from Hong Kong Polytechnic University and the University of Hong Kong conducted a systematic review and meta-analysis searching seven major databases through September 2024. They identified 42 randomized controlled trials encompassing 4,245 adults (65.5% female) that tested SHE as a primary intervention for insomnia. The primary outcome was change in Insomnia Severity Index (ISI) score.

Pooled analysis using a random-effects model showed SHE produced a statistically significant pre-to-post improvement in ISI score (mean difference 3.4 points, 95% CI 2.08–4.64), indicating a real but modest effect. However, head-to-head comparisons revealed SHE was inferior to full CBT-I (MD 3.8), partial CBT-I (MD 4.5), exercise programs (MD 2.9), and acupressure (MD 1.9) — all favoring the comparator.

For clinicians and patients, this means SHE alone is unlikely to be sufficient for clinically meaningful insomnia relief. It may serve a useful role as a low-barrier first step or adjunct, but should be paired with more intensive behavioral therapies when possible.

A critical caveat: 85.7% of included trials were rated high risk of bias, with the remainder raising 'some concerns.' The lack of standardized SHE protocols, poor treatment fidelity reporting, and inconsistent delivery methods limit confidence in the magnitude of the effects. Well-designed future trials are needed.