Objective sleep parameters are associated with distinct cognitive domains in euthymic bipolar disorder
In 40 euthymic individuals with bipolar disorder, actigraphy-measured sleep parameters were associated with cognitive performance. Longer assumed sleep duration was negatively associated with overall cognitive score (β = -0.38, p = 0.011), longer sleep onset latency was negatively associated with working memory (β = -0.41, p = 0.014) and processing speed (β = -0.38, p = 0.002), and greater wake after sleep onset was negatively associated with verbal fluency (β = -0.39, p = 0.016).
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Objective sleep parameters are associated with distinct cognitive domains in euthymic bipolar disorder The current body of evidence comprises 1 study. EvidenceHub rates the overall confidence at 34/100 (low).
The Claim
Objective sleep parameters are associated with distinct cognitive domains 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 disturbances persist during euthymia in bipolar disorder
- ▸Objective sleep parameters (duration, initiation, continuity) are measured via actigraphy
- ▸These parameters are associated with specific cognitive domains
- ▸Sleep continuity and initiation beyond duration alone correlate with cognitive functioning
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:
- ▸Exploratory cross-sectional design prevents causal inference
- ▸Small sample size (n=40) limits generalizability and statistical power
- ▸Results considered hypothesis-generating and require replication in larger longitudinal cohorts
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.
Which cognitive domains were affected by sleep parameters?▼
Assumed sleep duration was linked to overall cognition; total sleep time to delayed verbal learning; sleep onset latency to working memory and processing speed; and WASO to verbal fluency.
Was this a randomized controlled trial?▼
No, this was an exploratory cross-sectional observational study, not an RCT, so causality cannot be established.
What were the main limitations of the study?▼
The main limitations include a small sample size (n=40), cross-sectional design, and the authors note results are hypothesis-generating requiring replication.
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