They found that the students who had a nap did better in a test of cognitive function than their napless counterparts.

他们发现，在认知功能测试中，睡午觉生测试结果好于没睡午觉。

Even naps are beneficial, according to a Harvard study in which subjects who took a 90-minute snooze after learning a task performed 50 percent better over a 24-hour period than the napless group.

一项研究表明，即便是打个盹也会对记忆有帮助。受测者习后打盹90分钟人们在24小时内要比那些没有打盹人群表现更好。