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Longer objective sleep duration is associated with worse cognitive performance in euthymic bipolar disorder

In 40 euthymic individuals with bipolar disorder, longer assumed sleep duration measured by actigraphy was negatively associated with overall cognitive performance (SCIP total score, β = -0.38, p = 0.011), and longer total sleep time was negatively associated with delayed verbal learning (β = -0.48, p = 0.003). Longer sleep onset latency was linked to worse working memory and processing speed, and more wake after sleep onset was linked to worse verbal fluency.

Last updated: Jul 9, 2026•0 RCTs•📖 Read as article →

Evidence Score

Evidence Score34/100
Human RCT☆☆☆☆☆
Meta-analysis☆☆☆☆☆
Mechanism★★★★★
Safety★★★★☆
Confidencelow

Study Evidence

Study 1. Objective sleep parameters and cognitive performance in euthymic bipolar disorder: a cross-sectional 21-day actigraphy study.

observational

Libourel C, Charron M, Martinot V, Carminati M, Etain B, Hennion V · International journal of bipolar disorders (2026)

Participants: N/A
Duration: 21 days
Intervention: 21-day actigraphy monitoring of objective sleep parameters
Outcome: Cognitive performance measured by the Screen for Cognitive Impairment in Psychiatry (SCIP) total score and domain scores (delayed verbal learning, working memory, processing speed, verbal fluency)
Effect Size: β = -0.38 for assumed sleep duration and SCIP total score; β = -0.48 for total sleep time and delayed verbal learning
Population: 40 euthymic individuals with bipolar disorder

Result:

PubMed: 42371207DOI: 10.1186/s40345-026-00431-z

Mechanism Graph

Sleep disturbance alters neural processes involved in memory consolidation and executive function
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Disrupted sleep continuity impairs synaptic homeostasis and clearance of metabolic waste
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Prolonged sleep onset latency reflects hyperarousal or circadian misalignment affecting prefrontal cortex function
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Result: Longer sleep duration and poorer sleep quality correlate with reduced cognitive performance

Limitations

  • ⚠Cross-sectional design prevents causal inference
  • ⚠Small sample size (n=40) limits generalizability and increases risk of false positives
  • ⚠Exploratory nature with multiple comparisons, though FDR correction was applied

Frequently Asked Questions

What sleep parameters were measured in this study?▼

The study measured sleep duration, sleep onset latency, sleep efficiency, wake time after sleep onset (WASO), and fragmentation index using 21-day actigraphy.

Was longer sleep duration associated with better or worse cognition in bipolar disorder?▼

Longer sleep duration was associated with worse cognitive performance, specifically lower SCIP total scores and poorer delayed verbal learning.

What cognitive domains were affected by sleep onset latency?▼

Longer sleep onset latency was negatively associated with working memory and processing speed.

Is this study considered definitive?▼

No, the authors state these results are hypothesis-generating due to the small sample size and cross-sectional design, and require replication in larger longitudinal cohorts.

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References

  1. 1.Libourel C, Charron M, Martinot V, Carminati M, Etain B, Hennion V. "Objective sleep parameters and cognitive performance in euthymic bipolar disorder: a cross-sectional 21-day actigraphy study.." International journal of bipolar disorders, 2026. PMID: 42371207 DOI: 10.1186/s40345-026-00431-z
Disclaimer: This content is for educational purposes only and is not medical advice. Evidence scores reflect the quality and quantity of available research, not clinical recommendations. Always consult a healthcare professional before starting any supplement or intervention.