The JAMA Neurology study found that sleeping nine hours or more per night was linked to cognitive problems, particularly impaired decision-making.
Notes on verification
Confirmed by the primary JAMA Neurology study (Winer et al., 2021) and multiple independent secondary sources (Medscape, AlzInfo, Harvard Health) consistently describing long sleep duration's association with impaired executive function/decision-making. [cascade flags: aggregator_dropped_primary_exists | tier=silver indep_score=0.983 clusters=3 claim_tier=notable | framework convergence=single on Single JAMA Neurology 2021 study (Winer et al.) using data from the Anti-Amyloid Treatment in Asymptomatic Alzheimer's Disease (A4) study cohort (upstreams: Winer JR, Deters KD, Kennedy G, Jin M, Goldstein-Piekarski A, Poston KL, Mormino EC. JAMA Neurology 2021;78(10):1187-1196 (A4 study cohort)) — publishers independent, evidence may not be | kind=attributed eligibility=high]
Sources
- How much sleep keeps cognitive decline at bay? - Harvard Health (seed:psychology_and_neuroscience)
- https://pubmed.ncbi.nlm.nih.gov/34459862/ (corroboration)
- https://jamanetwork.com/journals/jamaneurology/fullarticle/2783664 (corroboration)
- https://www.alzinfo.org/articles/caregiving/too-little-or-too-much-sleep-tied-to-higher-alzheimers-risk/ (corroboration)