Sleep-stage mix and brain microvessel markers in a Hamburg cohort
In 154 Hamburg City Health Study participants, sleep with more light sleep relative to deep sleep was associated with higher PSMD and lower cortical thickness; REM versus non-REM sleep showed no such associations. The design was cross-sectional, so causality is unresolved. [1]
Automatic summary · not editorially reviewed
The key findings
The study included 154 participants from the population-based Hamburg City Health Study, mean age 63.26 years, 41.56% women. [1]
More light sleep relative to deep sleep was associated with higher log-transformed PSMD and lower cortical thickness. [1]
Because the design was cross-sectional, the authors say exact causality requires future longitudinal studies. [1]
The source at a glance
- Study type / format
- Cross-sectional analysis within a population-based cohort study
- Population / context
- 154 adults in the population-based Hamburg City Health Study, mean age 63.26 years, 41.56% women.
- Summary based on
- Study abstract
- Original publication
- September 23, 2026
Sleep and brain imaging in 154 Hamburg adults
The abstract describes a study within the population-based Hamburg City Health Study. Portable home sleep diagnostics (WatchPAT-200) were combined with brain imaging sensitive to subtle microstructural and cortical changes. The 154 participants averaged 63.26 years (standard deviation 8.19) and 41.56% were women. Regression models accounted for demographic, sleep-related and vascular risk factors.
Supporting source [1]
Light versus deep sleep linked to PSMD and cortex
Sleep compositions with a higher proportion of light sleep relative to deep sleep were associated with higher log-transformed PSMD (peak-width of skeletonized mean diffusivity) and lower cortical thickness. REM sleep relative to non-REM sleep was not associated with log-transformed PSMD or cortical thickness. No associations appeared between sleep-stage compositions and log-transformed white matter hyperintensity load or log-transformed perivascular space volume. Longer total sleep time was associated with relevant sleep apnea.
Supporting source [1]
Cross-sectional design limits causal reading
The authors describe PSMD as a sensitive biomarker for early microstructural changes before visible damage occurs, and they frame the findings as supporting early detection to preserve cerebrovascular health. However, they state that the exact causality requires future longitudinal studies because of the cross-sectional design. The abstract reports associations only; it does not show that sleep patterns cause these brain changes.
Supporting source [1]
How to interpret this
Abstract only; the full text was not reviewed. The design was cross-sectional, so associations cannot establish causality. Findings come from 154 participants of one cohort and are reported as associations, not causes.
Based on the study abstract; the full paper, tables and supplementary data were not reviewed.
Source & supporting passages
Ludwig M, Böttcher A, Petersen M, Nägele FL, Schell M, Clausen JF, Thomalla G, Schäfer I, Haack A, Betz C, Hoffmann AS, Cheng B. · europepmc.org · September 23, 2026