Question

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Sleep necessary for memories
Burning the midnight oil before an exam or interview is counterproductive according to research which found that sleep is necessary for memories to be downloaded into the brain.
A good night’s sleep within 30 hours of trying to remember a new task is a prerequisite of having good recall in the weeks ahead, scientists have found.
The research, published in the December issue of Nature Neuro-science, showed that it was the act of sleep, rather than the simple passage of time, that was critical for long-term memory formation.
“We think that getting that first night’s sleep starts the process of memory consolidation,” said Robert Stickgold, a sleep researcher at Harvard Medical School who conduct the latest study.
“It seems that memories normally wash out of the brain unless some process nails them down. My suspicion is that sleep is one of those things that does the nailing down,” Professsor Stickgold said.
With about one in five people claiming that they are so chronically short of sleep that it affects their daily activities, the latest work emphasizes the less well-understood side effect—serious memory impairment.

Volunteers in an experiment found it easier to remember a memory task if they were allowed to sleep that night. But for those kept awake, no amount of subsequent sleep made up for the initial loss.
Professor Stickgold’s team trained the 24 people to identify the orientation of three diagonal bars flashed for a sixtieth of a second on a computer screen full of horizontal stripes.
Half the subjects were kept awake that night, while the other half slept. Both groups were allowed to sleep for the second and the third nights to make up for any differences in tiredness between the volunteers.
Those who slept the first night were significantly and consistently better at remembering the task while the second group showed no improvement despite enjoying two nights os catch-up sleeep.

Answer 1

睡眠有助于记忆
经过研究证明，睡眠更加有助于大脑记忆储存。充足的睡眠可以让你在头脑清醒的状态下回忆起30个小时之内所记忆到的事情。12月刊的自然与科学杂志发布过，有效地睡眠可以加强大脑对记忆组织的构建。“我们认为头一天充足的睡眠可以为大脑更好的巩固记忆有所帮助。”罗伯特。斯蒂克高德说。哈维的医学院睡眠研究学家正在继续先前的研究 “人的记忆组织通常会清理掉大脑中的记忆，除非你刻意的把某些事情记忆下来。我们认为睡眠就是其中一项来刻意保留记忆的方法之一。”罗伯特。斯蒂克高德说。大约有1/5的人民没有良好的睡眠习惯，长期熬夜带来的副作用就是记忆力衰退，理解能力下降。
志愿者在实验中发现，如果前夜可以保持良好足够的睡眠，他们的记忆力有很大的提高。但是如果之后实验让他们不再睡觉，记忆力会迅速下降。
斯蒂克高德教授的团队实验了24个人，辨识电脑屏幕上布满横纹的FLASH图片，其中3组斜三角组合的以1/60秒的速度闪过。一半的志愿者当夜不被允许睡觉，而另一半则允许睡觉。2组人在第2天和第3天都被允许充足的睡眠来弥补先前的疲劳。
第一夜被允许睡觉的志愿者可以轻松回忆起第一天的实验过程，而第2组不被允许睡觉的志愿者则没有回忆起实验的过程，尽管随后的2天他们都已经补足了睡眠。

Answer 2

睡眠对记忆力来说很必要
研究发现，记忆要下载到大脑，睡眠是很必要的，考试或面试前挑灯夜战往往会起到适得其反的效果。
科学家已经发现，一个良好的30小时之内的睡眠是试图记住一项新的任务并在未来几周能够完整的回想起来的先决条件。
发表在《自然神经科学》12月份刊的调查显示，睡眠对长期记忆的形成事关重要，而不是简单的时间段。
Robert Stickgold，一个哈佛医学院的睡眠研究人员的最新研究发现：当天晚上的睡眠开启了记忆巩固的过程。
“记忆在大脑里慢慢消失是很正常的事情，除非一些过程使它们变得特别明确。我想睡眠就是使记忆变得明确的过程之一。” Stickgold 教授说。
五分之一的人会抱怨说他们长期缺乏睡眠以至于影响到他们的日常生活，最近的研究强调对事情理解不透彻也会造成严重的记忆障碍。
一个科学实验的志愿者发现，如果当天晚上有个好的睡眠，那么完成一项记忆任务就很容易。但是那些没有足够睡眠的人就要有损失了。

就到这里吧，希望对你有所帮助。