人为什么需要睡眠?为了遗忘
<p><span word="Over">Over</span> <span word="the">the</span> <span word="years">years</span>, <span word="scientists">scientists</span> <span word="have">have</span> <span word="come">come</span> <span word="up">up</span> <span word="with">with</span> <span word="a">a</span> <span word="lot">lot</span> <span word="of">of</span> <span word="ideas">ideas</span> <span word="about">about</span> <span word="why">why</span> <span word="we">we</span> <span word="sleep">sleep</span>.</p><p>关于我们为什么要睡觉，多年来，科学家提出了很多想法。</p><p><span word="Some">Some</span> <span word="have">have</span> <span word="argued">argued</span> <span word="that">that</span> <span word="it">it</span>’<span word="s">s</span> <span word="a">a</span> <span word="way">way</span> <span word="to">to</span> <span word="save">save</span> <span word="energy">energy</span>. <span word="Others">Others</span> <span word="have">have</span> <span word="suggested">suggested</span> <span word="that">that</span> <span word="slumber">slumber</span> <span word="provides">provides</span> <span word="an">an</span> <span word="opportunity">opportunity</span> <span word="to">to</span> <span word="clear">clear</span> <span word="away">away</span> <span word="the">the</span> <span word="brain">brain</span>’<span word="s">s</span> <span word="cellular">cellular</span> <span word="waste">waste</span>. <span word="Still">Still</span> <span word="others">others</span> <span word="have">have</span> <span word="proposed">proposed</span> <span word="that">that</span> <span word="sleep">sleep</span> <span word="simply">simply</span> <span word="forces">forces</span> <span word="animals">animals</span> <span word="to">to</span> <span word="lie">lie</span> <span word="still">still</span>, <span word="letting">letting</span> <span word="them">them</span> <span word="hide">hide</span> <span word="from">from</span> <span word="predators">predators</span>.</p><p>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。</p><p><span word="A">A</span> <span word="pair">pair</span> <span word="of">of</span> <span word="papers">papers</span> <span word="published">published</span> <span word="on">on</span> <span word="Thursday">Thursday</span> <span word="in">in</span> <span word="the">the</span> <span word="journal">journal</span> <span word="Science">Science</span> <span word="offer">offer</span> <span word="evidence">evidence</span> <span word="for">for</span> <span word="another">another</span> <span word="notion">notion</span>: <span word="We">We</span> <span word="sleep">sleep</span> <span word="to">to</span> <span word="forget">forget</span> <span word="some">some</span> <span word="of">of</span> <span word="the">the</span> <span word="things">things</span> <span word="we">we</span> <span word="learn">learn</span> <span word="each">each</span> <span word="day">day</span>.</p><p>周四在《科学》(<span word="Science">Science</span>)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。</p>
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