The JAMA Neurology study found that sleeping nine hours or more per night was linked to cognitive problems, particularly impaired decision-making.
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://jamanetwork.com/journals/jamaneurology/fullarticle/2783664 (jamanetwork.com)
- https://www.alzinfo.org/articles/caregiving/too-little-or-too-much-sleep-tied-to-higher-alzheimers-risk/ (alzinfo.org)
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