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Over the years, scientists have come up with a lot of ideas about why we sleep. 关于我们为什么要睡觉，多年来，科学家提出了很多想法。 Some have argued that it’s a way to save energy. Others have suggested that slumber provides an opportunity to clear away the brain’s cellular waste. Still others have proposed that sleep simply forces animals to lie still, letting them hide from predators. 有些人认为这是一种节约能量的方法。其他人提出，睡眠为大脑提供了清除细胞废物的机会。还有一些人认为，睡眠只是迫使动物静静地躺下来，让它们可以躲过捕食者。 A pair of papers published on Thursday in the journal Science offer evidence for another notion: We sleep to forget some of the things we learn each day. 周四在《科学》(Science)期刊上发表的两篇论文为另一个观念提供了证据：我们睡觉是为了忘记每天所学到的一些东西。 | 
