A study by public health scientists has revealed that getting too much or too little sleep can prematurely age your brain by up to seven years.
公众健康专家发布的报告称，过多或过少的睡眠都会使大脑早衰，最多可早衰7年。
They found that middle-aged adults whose sleep decreased to less than six hours a night over a five-year period suffered lower scores in reasoning and vocabulary tests.
科学家发现连续5年每晚睡眠少于6小时的中年人在关于推理和词汇的测试中得分较低。
Those whose nightly sleep increased to more than eight hours also showed signs of accelerated cognitive decline.
那些每晚睡眠超过8个小时的人也表现出感知能力衰退的迹象。
科学家发现每晚睡7小时的女人和每晚睡6-8小时的男人在感知能力测试中表现最好。
The findings suggest that regularly sleeping for seven hours during the night can help to reduce the cognitive decline that occurs as we grow older.
这项发现表明每晚睡7小时，能减少大脑早衰。
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