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Are you excessively sleepy during the day? If so, you may have a higher risk of Alzheimer's disease, according to a recent study published online Sept. 5, 2018, by the journal Sleep. 你白天特别困吗？《Sleep》杂志2018年9月5日新发表的研究表明，你如果特别困，那么患老年痴呆的风险就更高。 Scientists asked 124 healthy older adults, average age 60, about how often they felt drowsy or fell asleep during the day when they would rather be awake, as well as their napping habits. The group then had regular PET scans over the next 15 years to look for beta-amyloid in the brain, high amounts of which are a hallmark for Alzheimer's. 科学家找了124位平均年龄60岁的健康老人，询问他们白天想清醒的时候是否会感觉困倦或睡着，还询问了他们的午睡习惯。然后在接下来的15年里研究团队定期对他们进行PET扫描，在大脑中寻找β-淀粉样蛋白，含量过高就是患上了老年痴呆。 | 
