2020年MEM考试英语外刊阅读（十一）

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A long list of studies in recent years have linked Alzheimer's disease with a lack of sleep. But getting too much shut-eye may also raise the risk of the cruel memory-robbing disorder, according to research. Scientists found people who slept for nine hours or more per night showed a significant decline in memory and language skills, early markers of dementia.

Those who got less than six hours were also at risk, with researchers claiming the sleep sweet spot is seven to eight hours. The scientists say too much sleep has been linked to lesions in the brain known as white matter hyperintensities. They appear as white spots on an MRI scan and raise the risk of cognitive decline, dementia and a stroke.

Insomnia, and prolonged sleep duration appear to be linked to a decline in neurocognitive functioning that can precede the onset of Alzheimer's disease or other dementias. We observed that prolonged periods of sleep and chronic insomnia symptoms led to declines in memory, executive function and processing speed.

文本选自：DailyMail(每日邮报)

作者：Connor Boyd

原文标题：Too much sleep 'could give you dementia': People who get nine hours a night are more at risk of disorder

参考翻译

近年来，大量研究表明，阿尔茨海默病与睡眠不足有关。但也有研究表明，睡太多同样会增加患上这种令人痛苦的记忆丧失症的风险。科学家们发现，每晚睡眠时间超过9小时的人记忆力和语言能力有明显的下降，这些都是痴呆症的先兆。

睡眠不足6小时的人也有(患痴呆症)风险，研究人员称最佳睡眠时间为7至8小时。科学家表示，睡眠过多与名为白质高信号的大脑损伤有关。它们在核磁共振扫描中以白点的形式出现，会增加认知能力下降、痴呆和中风的风险。

失眠和睡眠时间过长似乎与神经认知功能的衰退有关，这种衰退现象可能在阿尔兹海默症或其他痴呆症发作之前出现。我们观察发现，睡眠时间过长和长期失眠症状均会导致记忆力、执行能力和反应速度下降。

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