Sleep and memory consolidation in healthy, neurotypical children, and adults: a summary of systematic reviews and meta-analyses.
Level 1 - systematic review of randomized trials
Systematic review of systematic reviews and meta-analyses
PubMed 39288097 · doi:10.1042/ETLS20230110
What was done
This systematic review of systematic reviews assessed the relationship between sleep and memory consolidation across life stages (children, adults, and older adults) in healthy, neurotypical populations. The authors used automated word-frequency tools and MeSH terms to build PubMed searches, trained a screening classifier on 4,854 decisions, screened 1,437 full-text records, and synthesized findings from 19 systematic reviews and meta-analyses.
What was found
The abstract reports qualitative synthesis findings without numerical effect sizes, test statistics, or confidence intervals: - Sleep enhanced memory consolidation, especially for complex declarative, prospective, and complex associative memory. - In children, sleep-dependent procedural memory consolidation was less robust and showed inconsistent benefits compared to declarative memory. - Meta-analytic evidence showed sleep benefits both emotional and neutral memory consolidation without a strong preferential effect for emotional memory. - Memory reactivation during slow-wave sleep and spindles were implicated in consolidation. - Older adults exhibited a noticeable reduction in sleep-dependent memory consolidation, particularly for declarative memory, linked to declines in slow-wave sleep.
Why it matters
This review synthesizes secondary meta-analytic evidence across the lifespan, demonstrating general sleep-dependent memory benefits while challenging the common assumption that sleep preferentially enhances emotional memories over neutral ones.
Limits
The abstract provides no numerical effect sizes or statistical metrics. As an umbrella review, findings rely on the methodological quality and potential primary study overlap of the 19 included systematic reviews and meta-analyses.
Cited by
- supports Sleep typically produces an approximate 20% improvement in declarative memory retention compared to lack of sleep or NMDA receptor blockade.