The JAMA Neurology study was observational and therefore could not prove that too little or too much sleep causes cognitive problems.
Sources
- How much sleep keeps cognitive decline at bay? - Harvard Health (health.harvard.edu)
- https://pubmed.ncbi.nlm.nih.gov/34459862/ (pubmed.ncbi.nlm.nih.gov)
- https://www.alzheimer-europe.org/news/new-research-jama-neurology-explores-impact-sleep-duration-amyloid-accumulation-and-cognitive?language_content_entity=en (alzheimer-europe.org)
- https://jamanetwork.com/journals/jamaneurology/fullarticle/2783664 (jamanetwork.com)
- https://pmc.ncbi.nlm.nih.gov/articles/PMC13343368/ (pmc.ncbi.nlm.nih.gov)
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