一般都认为睡眠能帮助各种生物记忆。然后说了个理论，接下来某个科学家T不认可这个理论，说睡眠其实是帮助forget而不是memory

　　接下来都在讲T的观点，穿插新老观点对撞什么的。

　　说是睡眠时会有一个机制，让大脑怎么怎么样(中间一大段不好意思有点失忆了……本来就没怎么看懂)

　　最后结论是大脑的这种活动会在夜间降低活动，保护容量和效率之类的。

　　V2：

　　这里提一下大脑在晚上干什么的这一篇。这一篇文章就是JJ里的原文，但是题目很难。因为文章意思很明朗，所以题目出的非常tricky，建议小伙伴把这篇原文认真读一下，生词(尤其是S开头的某一个词)查好，做好功课。狗主在考场上浪费了很多时间在这一篇，因为即使知道文章意思也不好选，都是细节的那种 infer题。

　　V3;

　　大脑晚上在干什么(考古v3的最后两段很接近考试题目的后两段，前面还有一段儿，看起来是把考古v3的前两段改写了下，重合率还是挺高的)

　　考古

　　V1:

　　有一篇是讲人类记忆和睡觉的睡眠与记忆科学家们一直认为睡眠可以帮助提高记忆，但Now一个K人(好像是)提出睡眠是让人们forget而不是remember，

　　然后第二段讲一些科学事实，基于这些事实科学家们人文睡眠提高记忆，但是K通过这些推断出了另一个理论，认为睡眠不能提高记忆，第三段是作者对K的理论的态度，认为他make sense，并说出了作者自己为什么觉得k的理论make sense。Unorthodox非正统的,最后一段说的是作者对这个宣称睡眠是为了帮助人们忘记东西的这个科学家的赤裸裸的赞扬!他说这个科学家的看法貌似非正统，无厘头，却十分make sense,因为人脑是有限的，如果不是因为大家睡觉的时候忘了很多东西脑子就装不下了

　　V2:

　　睡眠：一屏不到三段还是四段吧 传统观点认为睡眠会使记忆更加深刻，而后来一个什么人发现其实睡眠的目的是忘记而不是更深刻记忆。。。最后一段说这个人的观点其实是u。。。(一个u开头的单词，可能是指悖论之类的吧)挺简单的感觉

　　题目考了主旨题：其中有选项说为了建立一个u...什么的观点，我没选这个。。。还有细节题若干。。。

　　这位楼主说的大致对，这个U打头的词是uorthodox,最后一段说的是作者对这个宣称睡眠是为了帮助人们忘记东西的这个科学家的赤裸裸的赞扬!他说这个科学家的看法貌似非正统，无厘头，却十分make sense,因为人脑是有限的，如果不是因为大家睡觉的时候忘了很多东西脑子就装不下了

　　V3：

　　Our need for sleep is somehow tied to our ability to remember. Slumber is known to improve recall in creatures from fruit flies to humans, and the reigning theory among neuroscientists has been that the waves of brain activity during deep sleep reactivate neurons that were triggered during the day, strengthening neuronal connections and cementing them into solid memories. Now Giulio Tononi, a neuroscientist at the University of Wisconsin, says sleep scientists have it all wrong: We don't sleep to remember, we sleep to forget.

　　About 1,000 times a night, billions of neurons undergo a synchronous one-second burst of non-REM electrical activity. The longer a person has been sleep-deprived, the bigger the initial burst. Throughout the night the bursts become progressively smaller, until they finally disappear completely just before waking. Most researchers interpret this activity as the brain slowly reinforcing synaptic connections that already exist, but Tononi noticed that after each wave, the brain goes completely silent, which never happens when we're awake.

　　As we sleep, says Tononi, the brain isn't building but rather downscaling, and these silences between waves play a key role. "Going up and down, up and down, basically all the neurons fire and then all are silent—it's a wonderful way for the brain to tell the synapses to get weaker," Tononi explains. He suspects the progressive weakening allows only the strong connections to survive.

　　The theory is unorthodox, but it does make a certain amount of sense. Without the ability to pare away unneeded information as we sleep, our brains would face a serious energy shortage as well as a space crunch: Stronger synapses are typically bigger, and real estate in the brain is precious. By proportionally weakening synapses, the brain ensures that they retain the same strength relative to each other. So when we wake up each morning, all of our synapses are weaker, or have vanished. With them, our smallest memories from each day may be lost forever. Our need for sleep is somehow tied to our ability to remember.