Behavioral interventions to extend sleep duration: A systematic review and meta-analysis

Area of Science:

• Behavioral sleep science
• Sleep medicine
• Public health

Background:

• Sleep duration is crucial for cognitive and physical health in children and adults.
• Behavioral interventions aim to increase sleep duration, but their effectiveness requires systematic evaluation.
• Understanding the impact of different intervention strategies is key to optimizing sleep health.

Purpose of the Study:

• To systematically review and meta-analyze the effects of behavioral sleep extension interventions on sleep duration.
• To assess the efficacy of these interventions across different age groups (children and adults ≥ 12 years).
• To identify factors influencing intervention effectiveness, such as intervention type and study design.

Main Methods:

• Systematic literature review and meta-analysis of 42 studies from 14 countries.
• Inclusion of studies involving children (middle/high school) and adults (including college students).
• Analysis of pooled standardized mean difference (SMD) for sleep duration in two-arm and one-arm studies.

Main Results:

• Behavioral sleep extension interventions significantly increased sleep duration compared to control or baseline.
• Pooled SMD was 0.80 for two-arm studies and 0.75 for one-arm studies, both statistically significant.
• Direct interventions (specifying sleep schedules) yielded larger effects than indirect methods (coaching, education).
• A higher number of curriculum components was associated with smaller effect sizes.

Conclusions:

• Behavioral sleep extension interventions are effective in increasing sleep duration across diverse populations.
• Directly targeting sleep schedules is more effective than indirect approaches.
• Improving intervention descriptions and employing rigorous study designs are essential for research quality and reproducibility in sleep science.