在线观看亚洲精品专区-在线观看亚洲免费-在线观看亚洲免费视频-在线观看亚洲欧美-欧美freexxx-欧美free嫩交video

食品伙伴網(wǎng)服務(wù)號
 
 
當(dāng)前位置: 首頁 » 專業(yè)英語 » 英語短文 » 正文

為啥有些人需要那么少的睡眠?

放大字體  縮小字體 發(fā)布日期:2009-08-18
核心提示:Some of the world's greatest leaders, from Napoleon Bonaparte and Winston Churchill to Bill Clinton and Margaret Thatcher, are said to have managed on just four to six hours' sleep a night, whereas the typical teenager finds it difficult to get out

    Some of the world's greatest leaders, from Napoleon Bonaparte and Winston Churchill to Bill Clinton and Margaret Thatcher, are said to have managed on just four to six hours' sleep a night, whereas the typical teenager finds it difficult to get out of bed in less than 10.

    Newborn babies can sleep for up to 18 hours - admittedly at irregular intervals - whereas an elderly person may find it hard to sleep longer than six, although they often have to resort to the odd afternoon nap to make up for what they lacked at night.

    Sleep is the quintessential ingredient of life. Every animal does it at some point in the 24-hour cycle and people who are forcibly deprived of sleep are effectively undergoing torture. But the big unanswered question is how much sleep do we actually need?

    Some people seem happy with four or five hours, although most people would feel sleep-deprived on less than six. Others need a good seven or eight hours of sleep and adolescents are renowned for extended kips.

    So how much sleep is necessary for a healthy mind and body, and does this amount truly need to vary between people and age groups?

    The latest study into sleep may help to resolve the issue with the discovery that certain people in the population carry the smallest of genetic mutations in a gene that appears to play a significant role in deciding just how much sleep human beings need.

    Scientists studied an extended family in California and found that a mother and her daughter shared a life-long habit of rising in the very early hours of the morning with no apparent ill-effects. They routinely went to bed between 10.30pm and 11pm and got up between 4am and 4.30am.

    The researchers took blood samples from all members of the family and analysed their DNA for any signs that could explain this unusual behaviour. The tests revealed that the mother and her daughter did in fact share a tiny "point mutation" in a gene known as hDEC2, which is known to affect the regulation of other genes and has been implicated in the control of sleeping patterns in animals.

    一些世界頂級領(lǐng)袖,從拿破侖·邦那巴,溫斯頓·丘吉爾到比爾·克林頓再到瑪格萊特·撒切爾,據(jù)說他們每天晚上僅需4到6個小時的睡眠時間,相比典型的青少年卻覺得不夠十小時就要爬起床真是難啊。

    新生兒一天睡眠達(dá)到18個小時之多--當(dāng)然期間有不規(guī)律的間斷。而老年人盡管他們時常得睡個額外的午覺來彌補(bǔ)夜間的睡眠不足,他們?nèi)詴X得很難一天睡得超過6個小時。

    睡眠是生命不可或缺的重要養(yǎng)分。每種動物都要在24小時的周期內(nèi)睡上一段時間,被強(qiáng)迫性剝奪睡眠的人肯定甚感折磨。但是,不得而解的大謎團(tuán)是,我們究竟需要多少睡眠時間?

    有些人只需四五個小時就心滿意足了,雖然大多數(shù)人會覺得少于六小時簡直就是被剝奪了睡眠的權(quán)利。有些人則需要七八小時的質(zhì)量好的睡眠。青少年則是以睡懶覺出了名的。

    那么為了身心健康,多少睡眠才合適呢?是不是不同的人或不同的年齡段的人對睡眠時間的要求也不一樣呢?

    最新的研究可能有助于解決這個疑問。研究發(fā)現(xiàn),有部分人的基因攜帶了最小的基因突變,而這在決定人類究竟需要多少睡眠的問題上起了關(guān)鍵的作用。

    科學(xué)家對加利福尼亞的一個大家庭做了研究,他們發(fā)現(xiàn)有一對母女都有一個一輩子的習(xí)慣,她們清晨很早的時侯就起床了,沒有什么明顯的不良反應(yīng)。這對母女日如一日地在晚上十點(diǎn)半至十一點(diǎn)就寢,次日四點(diǎn)至四點(diǎn)半起床。

    研究人員對這個家庭的所有成員抽了血樣來分析他們的DNA以尋出任何可能解釋這個不尋常之舉的體征。這項(xiàng)測試發(fā)現(xiàn),這對母女的基因里都攜帶了一個細(xì)小的"點(diǎn)突變",即hDEC2.眾所周知,這個點(diǎn)突變影響了其他基因組織,從而參與決定了動物的睡眠類型。

更多翻譯詳細(xì)信息請點(diǎn)擊:http://www.trans1.cn
 
關(guān)鍵詞: 睡眠 英語短文
[ 網(wǎng)刊訂閱 ]  [ 專業(yè)英語搜索 ]  [ ]  [ 告訴好友 ]  [ 打印本文 ]  [ 關(guān)閉窗口 ] [ 返回頂部 ]
分享:

 

 
推薦圖文
推薦專業(yè)英語
點(diǎn)擊排行
 
 
Processed in 4.216 second(s), 783 queries, Memory 3.32 M
主站蜘蛛池模板: 天堂网在线新版www 天堂网在线资源 | 清朝荒淫牲艳史在线播放 | 两性色午夜视频免费播放 | 亚洲另类电击调教在线观看 | 日韩三级在线免费观看 | 免费能看的黄色网址 | 亚洲国产日韩欧美在线as乱码 | videosxxoo18在线| 女人被狂躁视频网站免费 | 亚洲视频四区 | 久久精品国产6699国产精 | 色网站在线播放 | 13日本xxxxxxxxx18 1515hh四虎免费观38com | av天天看| 日韩免费视频一区二区 | 久久国产精品无码网站 | 国产精品午夜免费观看网站 | 日本大片成人免费播放 | 婷婷激情五月综合 | 天堂综合网| 婷婷四房播客五月天 | 在线免费成人网 | 在线久综合色手机在线播放 | 网站色| 天天舔天天射 | 久久9966精品国产免费 | 欧美在线视频7777kkkk | 国产 麻豆 欧美亚洲综合久久 | 国产乱人视频免费播放 | 夜夜操国产 | 国产骚b | 中文字幕11页 | 美女一级牲交毛片视频 | 亚洲国产精品自在现线让你爽 | 日韩一级精品视频在线观看 | 黄的三级在线播放 | 欧美18videosex性欧美69 | 天天干干天天 | 亚洲成人三级电影 | 夜夜操夜夜 | 97色资源 |