摘要：It is understandable that some people obsess over getting enough sleep. Widely covered animal research shows that the brain’s clea

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New_Scientist_USA_-_4_November_2023

It is understandable that some people obsess over getting enough sleep. Widely covered animal research shows that the brain’s cleaning system ramps up at night, ridding it of toxic compounds linked to Alzheimer’s disease, such as a protein called beta-amyloid.

人们对充足睡眠的执着追求不难理解。大量动物研究表明，大脑夜间会增强清洁功能，清除与阿尔茨海默病相关的有毒化合物（如β-淀粉样蛋白）。

And large population studies have generally found that people with unusually short or long sleep durations have worse health by several measures, including memory loss and brain shrinkage, one of the hallmarks of Alzheimer’s.

大规模人群研究亦显示，睡眠时长异常（过短或过长）的人群在多项健康指标（包括记忆力衰退和脑萎缩）上表现更差，而脑萎缩正是阿尔茨海默病的标志性特征之一。

Typically, there is a roughly U-shaped curve for the relationship between hours of slumber and the chances of a bad health outcome, such as dementia, and an inverted U-shaped curve for measures where a higher value signifies better health, such as brain volume seen on an MRI scan.

睡眠时长与健康风险（如痴呆症）的关系通常呈U型曲线，而与健康正向指标（如核磁共振扫描显示的脑容量）的关系则呈倒型曲线。

核心词汇：

来源：走近教育