Review links sleep, gut diversity, and cognition in healthy adults
In healthy adults, better objective sleep measures were linked to greater gut microbial diversity, which also correlated with better cognitive function. These observational results cannot establish causation.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
In healthy adults, better objective sleep measures and cognitive function were associated with greater gut microbial diversity. Because most studies were cross-sectional, these links do not establish cause and effect. Separate probiotic studies reported improvements in patients with cognitive impairment; the abstract does not give comparison details or effect sizes.
This summary uses only the abstract, which provides no pooled estimates. No included study assessed sleep, gut microbes, and cognition together in people with cardiovascular disease, leaving that population unaddressed.
What the studies linked
The review considered sleep efficiency and total sleep time alongside gut composition and cognitive testing. In healthy adults, objectively measured sleep was associated with microbial diversity, which was also related to cognitive performance and patterns of brain connectivity.
What probiotic studies reported
The probiotic studies concerned people with cognitive impairment and reported improvements in sleep quality and cognition, alongside altered gut composition. Those findings apply to a distinct clinical group; the abstract does not establish benefits for healthy adults.
The original publication
Gut microbiota, sleep quality, and cognitive function in adults: A systematic review.
Varpaei HA, Robbins LB, Reeves MJ et al.
Sleep Med · 2026
- PubMed ID
- 41671845
- Record checked
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