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.
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Longer objective sleep duration is associated with worse cognitive performance in euthymic bipolar disorder The current body of evidence comprises 1 study. EvidenceHub rates the overall confidence at 34/100 (low).
The Claim
Longer objective sleep duration is associated with worse cognitive performance in euthymic bipolar disorder
This conclusion is most relevant to: 40 euthymic individuals with bipolar disorder.
What the Research Shows
The conclusion draws on 1 linked study. Highlights from the cited literature:
- ▸Objective sleep parameters and cognitive performance in euthymic bipolar disorder: a cross-sectional 21-day actigraphy study. (International journal of bipolar disorders, 2026) —
How It Works
The proposed biological pathway:
- ▸Sleep disturbance alters neural processes involved in memory consolidation and executive function
- ▸Disrupted sleep continuity impairs synaptic homeostasis and clearance of metabolic waste
- ▸Prolonged sleep onset latency reflects hyperarousal or circadian misalignment affecting prefrontal cortex function
- ▸Result: Longer sleep duration and poorer sleep quality correlate with reduced cognitive performance
Who Might Benefit
Evidence fit by population:
- ▸40 euthymic individuals with bipolar disorder
Recommended Dose
N/A
Limitations & Caveats
Important context when interpreting this evidence:
- ▸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.
References
- 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