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Associations between slow-wave sleep and dementia: a systematic review
Summary
Disturbances in slow-wave sleep (SWS) are linked to dementia. Most studies show reduced SWS in dementia patients, but more longitudinal research is needed to confirm if SWS decline predicts dementia onset.
Area of Science:
- Neuroscience
- Sleep Medicine
- Gerontology
Background:
- Sleep disturbances, particularly slow-wave sleep (SWS) alterations, are increasingly recognized as potential factors in neurodegenerative diseases.
- Dementia encompasses a range of conditions characterized by cognitive decline, impacting memory, thinking, and behavior.
Purpose of the Study:
- To systematically review existing literature and evaluate the association between slow-wave sleep (SWS) disturbances and dementia.
- To synthesize findings from cohort and case-control studies investigating SWS differences in individuals with and without dementia.
Main Methods:
- A systematic literature search was conducted using PubMed and Embase databases.
- Included studies were cohort or case-control designs comparing SWS in dementia patients versus healthy controls.
- Study quality was assessed using the Newcastle-Ottawa Scale.
Main Results:
- Nineteen studies (3 cohort, 16 case-control) were analyzed.
- A majority of studies (1 cohort, 14 case-control) indicated an association between reduced SWS and dementia.
- Evidence for the SWS-dementia link was more robust in case-control studies compared to cohort studies.
Conclusions:
- Current evidence predominantly stems from cross-sectional studies, limiting causal inference.
- Longitudinal studies are crucial to determine if SWS reduction can predict the incidence of dementia.
- Future research should employ multi-night recordings and standardized criteria for improved accuracy and comparability.
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