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If You Sleep 9 Hours or More, the Risk of Dementia Is up to 2.2 Times, and if It's Too short... the “Risk Level” Warned by Masashi Yanagisawa, an Authority on Somnology

How does lack of sleep affect the mind and body? Novelist Hitoshi Mayama said, “When I interviewed Professor Masashi Yanagisawa of the University of Tsukuba, who is a leading expert in sleep science, I found that short sleep time itself raises the risk of dementia.” (Part 1)
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How does lack of sleep affect the mind and body? Novelist Hitoshi Mayama said, “When I interviewed Professor Masashi Yanagisawa of the University of Tsukuba, who is a leading expert in sleep science, I found that short sleep time itself raises the risk of dementia.” (Part 1)

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PRESIDENT Online(プレジデントオンライン) broke the news on Saturday, November 14, 2026.
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