三级aa视频在线观看-三级国产-三级国产精品一区二区-三级国产三级在线-三级国产在线

首 頁 | 新聞英語 | 視聽英語 | 翻譯園地 | 實用英語 | 專欄作家 | 奧運英語 | 新詞新譯 | 書友天地 | 輕松英語  | 凈臉聯盟 | 英語論壇 | 少兒英語
您現在的位置: En_language tips > 輕松英語 > 一問到底 Dec 26, 2005
 





  How much sleep do we need?

sleep  
How much sleep do we need? Notes:

The amount of sleep an individual requires varies from person to person, but most adults average eight hours of sleep.

Sleep plays a vital role in our daily regimen, as during this dormant period, it recharges and rejuvenates weary body organs and tissues, and restores the body to an alert state. A person's lifestyle is another variable in the amount of time he needs to achieve this healthy balance, and to feel well rested upon awakening.

The quality of a person's sleep also factors into the sleep equation. When we drift off to sleep, we either fall into a deep, restful sleep, or into a shallow, light sleep. One who normally requires eight hours of sleep, but sleeps shallowly, will most likely awaken feeling tired. In contrast, if the same individual sleeps fewer hours, but lapses into a state of deep sleep, he may well awaken refreshed and invigorated.

A lucky few can bypass shallow sleep altogether, and fall directly into deep sleep on an as needed basis. Alexander the Great's military prowess may have been due, in part, to his ability to take a "cat nap."

Yet one more variable factors into the amount of sleep we require: that of the brain and of the body sleeping simultaneously. Under normal circumstances, the brain's sleep center blocks off the nerves to the brain and to the body to make sleep possible. The brain has no interest in doing anything, and could not even if it did, because the sleep center has shut down the internal organs, the arms, and the legs. Sometimes, however, the sleep center is unsuccessful in shutting down both the brain and the body at the same time. For example, in times of war, it is not unusual for soldiers suffering from sleep deprivation and from combat fatigue to continue to march, despite the fact that their brains have halted. Thankfully, such a situation is an anomaly, and does not occur with great frequency.

 

 

regimen: 生活制度
rejuvenate:使恢復,使年輕

 

 

 

 

 


invigorated
:精神煥發的


prowess:威力

 

 

 



deprivation:剝奪

anomaly:不正常的

 
 
 
Copyright by chinadaily.com.cn. All rights reserved
版權聲明:未經中國日報網站許可,任何人不得復制本欄目內容。如需轉載請與本網站聯系。
None of this material may be used for any commercial or public use. Reproduction in whole or in part without permission is prohibited.
主站蜘蛛池模板: 亚洲一区二区在线免费观看 | 国产一区二区播放 | 五月天久久久 | 久草手机在线观看视频 | 亚洲欧美综合日韩字幕v在线 | 午夜国产精品久久影院 | 色综合天| 古代级a毛片可以免费看 | 免费精品精品国产欧美在线 | 国产成人在线免费 | 国产一精品一aⅴ一免费 | 国产美女视频做爰 | 黑人和黑人激情一级毛片 | 黄色网址免费在线观看 | 免费一级特黄3大片视频 | 最新国语露脸精品国产 | 亚洲人成网站观看在线播放 | 影音先锋ady69色资源网站 | 久久精品国内一区二区三区 | 92午夜剧场 | 日韩欧美一区二区三区在线播放 | 国产91精品露脸国语对白 | 亚洲视频高清 | 日本一级特黄aa大片 | 在线看欧美日韩中文字幕 | 毛片aaa| 国产剧情第一页 | 精品久久久久久久 | 欧美人成片免费看视频不卡 | 亚洲加勒比久久88色综合1 | 拍拍拍拍拍拍拍无挡大全免费 | 最新国语露脸精品国产 | 337d欧美人体大胆瓣开下面 | 欧美亚洲免费 | 亚洲国产高清精品线久久 | 成人欧美视频在线看免费 | 亚洲一区二区在线播放 | 欧美日韩亚洲一区二区三区在线观看 | 色婷婷狠狠久久综合五月 | 国偷盗摄自产福利一区在线 | 色婷婷狠狠久久综合五月 |