斯坦福大学的新研究发现，老年人保持正常的睡眠时间很重要。如果睡眠时间不足6个小时，患痴呆症的风险会增加；如果睡眠时间超过9个小时，大脑执行力会变差。
Older adults who sleep six hours or fewer a night may have elevated risk for dementia and other cognitive1 issues, a new study finds.
一项新研究发现，每晚睡眠时间在6个小时以下的老年人患痴呆症和其他认知障碍的风险会增高。
Researchers at Stanford University measured seniors' (ages 65 to 85) dementia risk and cognitive abilities, finding higher risk in those patients who regularly slept six or fewer hours compared to those who slept seven or eight hours.
斯坦福大学的研究人员通过对年龄在65岁到85岁之间的老年人的痴呆风险和认知能力测评发现，平时睡眠6个小时以下的人相比睡7个或8个小时的人痴呆风险更高。
Those seniors who slept nine or more hours also had lower cognitive functions and other health issues, but the researchers didn't find the same high dementia risk in this group.
平时睡9个小时以上的人也出现了认知能力低下和其他健康问题，但是研究人员发现该群体的痴呆风险不像睡眠不足的人群这么高。
The findings demonstrate how important it is for adults to maintain a healthy sleep cycle, especially as they get older.
研究结果表明，成年人保持一个健康的睡眠周期有多么重要，尤其在步入老年之后。
As adults age, it's common fo
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