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This evidence decision is attached to the maintained Brali entry above. The public protocol may be narrowed, reviewed, or kept practical according to the decision.
Evidence Ledger · Protocol candidate · reviewed 2026-08-19
Behavioral interventions to extend sleep duration: A systematic review and meta-analysis
The reviewed source can support a conservative practical protocol.
Brali decision: Protocol candidate. This page summarizes a reviewed evidence boundary; it does not reproduce the source and it does not turn one paper into a universal prescription.
What the source supports
Behavioral interventions designed to extend sleep increased sleep duration on average compared with control or baseline. Direct interventions that specified a sleep schedule tended to have larger effects, but results were highly heterogeneous.
What it does not establish
- A self-tracking experiment can identify one scientifically optimal personal sleep duration.
- A fixed bedtime or wake-time tolerance is proven to improve health or cognition for everyone.
- A 21-day experiment, 30-minute duration bins, or a particular alertness score is evidence-based.
- Sleep extension by itself is a treatment for chronic insomnia or another sleep disorder.
- Consumer sleep-stage estimates are required to decide how much sleep a person needs.
Important limitations
- Statistical heterogeneity was very high across both two-arm and one-arm studies.
- Populations, intervention components, duration and measurement methods varied substantially.
- The primary outcome was sleep duration; the review does not establish a single personal optimum for daytime performance or health.
- The findings do not replace clinical assessment for persistent insomnia, excessive sleepiness, suspected sleep disorders, or other medical concerns.
Source context
Behavioral interventions to extend sleep duration: A systematic review and meta-analysis
- Source type: meta-analysis
- Design: Systematic review and meta-analysis of 42 behavioral sleep-extension studies, including controlled two-arm and one-arm designs.
- Population: Participants aged 12 years and older across adult, college-student, adolescent and other samples in 14 countries.
- Exposure / intervention: Behavioral interventions intended to increase sleep duration, ranging from direct sleep-schedule changes to coaching and educational approaches.
- Outcomes: Sleep duration
Citation: Baron KG, Duffecy J, Reutrakul S, et al. Sleep Medicine Reviews. 2021;60:101532.
DOI: 10.1016/j.smrv.2021.101532
What this changes in Brali
Editorial note: Promote only as a conservative protocol for protecting adequate sleep opportunity and observing trends. Pair public adult-duration wording with the AASM/SRS consensus; do not revive the inherited optimization experiment or infer causality from the separate sleep-variability observational review.
Use the boundary, not just the headline
When an AI agent or a person retrieves this decision, preserve both the supported claim and the unsupported or overstated claims. Dropping the boundary would turn a reviewed source into a stronger claim than Brali actually maintains.
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