Subcortical sleep-wake regions and sleep measures in Alzheimer's disease and healthy controls
In 57 adults (45 with biomarker-confirmed Alzheimer's disease, 12 cognitively healthy controls), MRI measures of subcortical sleep-wake regions were associated with polysomnographic sleep parameters; the abstract reports correlations, not causes. [1]
Automatic summary · not editorially reviewed
The key findings
Fifty-seven adults were studied: 45 with biomarker-confirmed Alzheimer's disease and 12 cognitively healthy controls with normal pTau217 plasma levels. [1]
Higher anterior hypothalamic volumes correlated with greater time in bed. [1]
The authors describe subcortical circuits as potential targets to alleviate sleep symptoms and modify disease progression. [1]
The source at a glance
- Study type / format
- Abstract of an in vivo observational study with overnight polysomnography and 3T brain MRI
- Population / context
- 57 adults: 45 with biomarker-confirmed Alzheimer's disease and 12 cognitively healthy controls with normal pTau217 plasma levels, recruited at the Hospital Clínic de Barcelona.
- Summary based on
- Study abstract
- Original publication
- September 24, 2026
Sleep-wake brain regions and sleep in 57 adults
The study asked whether MRI-derived measures of subcortical sleep-wake regulating regions relate to sleep recorded by polysomnography. Fifty-seven adults were recruited at the Hospital Clínic de Barcelona: 45 with biomarker-confirmed Alzheimer's disease and 12 cognitively healthy controls with normal pTau217 plasma levels. All completed overnight polysomnography and 3T brain MRI, including a neuromelanin-sensitive sequence. Measured structures were wake-promoting regions (locus coeruleus, posterior hypothalamus, basal forebrain) and a sleep-promoting region (anterior hypothalamus).
Supporting source [1]
Correlations with sleep time, stages and arousals
Sleep parameters included total sleep time, sleep efficiency, time in REM and non-REM stages, REM sleep latency, wake after sleep onset and arousals. Among sleep-promoting regions, higher anterior hypothalamic volumes correlated with greater time in bed. The abstract lists further correlations with values such as ρ = 0.25, ρ = -0.22, ρ = 0.32, ρ = 0.18 and ρ = -0.25, but the truncated text does not show which sleep measure belongs to which value. A principal component analysis was used to derive patterns of sleep-wake regulation.
Supporting source [1]
Abstract-only scope and open questions
The authors state that in vivo evidence linking subcortical sleep-wake structures to sleep phenotypes is limited. They describe their findings as aligning with prior post-mortem research and as highlighting these circuits as potential targets to alleviate sleep symptoms and modify disease progression. These are proposed directions, not demonstrated benefits. This explainer is based on the abstract only; the full text was not reviewed, so design details, the complete correlation results and their uncertainty cannot be checked here.
Supporting source [1]
How to interpret this
Abstract only; the full text was not reviewed. The abstract text is truncated, so several correlation values cannot be matched to specific sleep measures, and design details and uncertainty are not fully reported. Associations do not show causation.
Based on the study abstract; the full paper, tables and supplementary data were not reviewed.
Source & supporting passages
Pérez-Millan A, Mayà G, Martín-Sobrino I, Peña-González M, Val-Guardiola A, Fernández-Villullas G, Bosch B, Tort-Merino A, Lladó A, Morales-Ruiz M, Walsh CM, Neylan TC, Gaig C, Muñoz-Moreno E, Sánchez-Valle R, Iranzo A, Grinberg LT, Falgàs N. · europepmc.org · September 24, 2026