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Re:Improving deep sleep may prevent dementia, study finds by zeroonetwothree on Wednesday November 01, 2023 @12:09PM (#38100332)
Your link literally says: “ Epidemiologic studies have provided inconclusive evidence for a protective effect of caffeine consumption on risk of dementia and cognitive decline.”

That doesn’t sound very convincing.

Re:Improving deep sleep may prevent dementia, study finds by 1970-01-01 on Wednesday November 01, 2023 @03:41PM (#38103795)
Context is key. You've just cited the concept under challenge. The summary and conclusion literally says it "may reduce the risk of dementia and cognitive decline, and may ameliorate cognitive decline in cognitively impaired individuals."