What you didn't know about the verges of sleep 你不知道的“入睡边缘”常识
<p>随身英语<span word="What">What</span> <span word="you">you</span> <span word="didn">didn</span>'<span word="t">t</span> <span word="know">know</span> <span word="about">about</span> <span word="the">the</span> <span word="verges">verges</span> <span word="of">of</span> <span word="sleep">sleep</span> 你不知道的“入睡边缘”常识</p><p>每个人一生中大约有三分之一的时间都处于睡眠状态。一直以来，科学家对于人类为什么要睡觉，睡觉时大脑究竟处于什么状态等问题进行了多方面的深入研究。那么，当人类处于睡眠边缘状态时，身体里到底发生着什么变化？它又意味着什么？新的研究正在寻找这些答案。本集《随身英语》介绍有关人类睡眠边缘状态的研究。</p><p>课文内容<span word="Vocabulary">Vocabulary</span>: <span word="sleep">sleep</span> 词汇: 睡眠</p><p><span word="How">How</span> <span word="long">long</span> <span word="does">does</span> <span word="it">it</span> <span word="take">take</span> <span word="you">you</span> <span word="to">to</span> <span word="fall">fall</span> <span word="asleep">asleep</span>? <span word="Are">Are</span> <span word="you">you</span> <span word="out">out</span> <span word="like">like</span> <span word="a">a</span> <span word="light">light</span> <span word="as">as</span> <span word="soon">soon</span> <span word="as">as</span> <span word="your">your</span> <span word="head">head</span> <span word="hits">hits</span> <span word="the">the</span> <span word="pillow">pillow</span>, <span word="or">or</span> <span word="does">does</span> <span word="it">it</span> <span word="take">take</span> <span word="you">you</span> <span word="more">more</span> <span word="than">than</span> <span word="a">a</span> <span word="little">little</span> <span word="time">time</span> <span word="to">to</span> <span word="doze">doze</span> <span word="off">off</span>?</p><p><span word="If">If</span> <span word="the">the</span> <span word="average">average</span> <span word="night">night</span>’<span word="s">s</span> <span word="sleep">sleep</span> <span word="is">is</span> <span word="eight">eight</span> <span word="hours">hours</span>, <span word="or">or</span> <span word="a">a</span> <span word="third">third</span> <span word="of">of</span> <span word="a">a</span> <span word="day">day</span>, <span word="then">then</span> <span word="it">it</span> <span word="means">means</span> <span word="we">we</span> <span word="spend">spend</span> <span word="around">around</span> <span word="one">one</span> <span word="third">third</span> <span word="of">of</span> <span word="our">our</span> <span word="lives">lives</span> <span word="in">in</span> <span word="this">this</span> <span word="dormant">dormant</span> <span word="state">state</span>. <span word="Science">Science</span> <span word="already">already</span> <span word="has">has</span> <span word="reams">reams</span> <span word="of">of</span> <span word="data">data</span> <span word="on">on</span> <span word="the">the</span> <span word="brain">brain</span>’<span word="s">s</span> <span word="activity">activity</span> <span word="during">during</span> <span word="sleep">sleep</span> <span word="itself">itself</span>. <span word="Now">Now</span>, <span word="an">an</span> <span word="international">international</span> <span word="group">group</span> <span word="of">of</span> <span word="researchers">researchers</span> <span word="at">at</span> <span word="the">the</span> <span word="University">University</span> <span word="of">of</span> <span word="Cambridge">Cambridge</span> <span word="are">are</span> <span word="researching">researching</span> <span word="that">that</span> <span word="dopey">dopey</span> <span word="state">state</span> <span word="we">we</span> <span word="all">all</span> <span word="go">go</span> <span word="through">through</span> <span word="between">between</span> <span word="wide">wide</span> <span word="awake">awake</span> <span word="and">and</span> <span word="fast">fast</span> <span word="asleep">asleep</span>.</p><p><span word="This">This</span> <span word="transitional">transitional</span> <span word="period">period</span> <span word="usually">usually</span> <span word="lasts">lasts</span> <span word="between">between</span> <span word="five">five</span> <span word="and">and</span> 20 <span word="minutes">minutes</span>, <span word="says">says</span> <span word="Sridhar">Sridhar</span> <span word="Rajan">Rajan</span> <span word="Jagannathan">Jagannathan</span>, <span word="one">one</span> <span word="of">of</span> <span word="Cambridge">Cambridge</span>’<span word="s">s</span> <span word="Gates">Gates</span> <span word="Scholars">Scholars</span>. <span word="However">However</span>, <span word="people">people</span> <span word="exhibit">exhibit</span> <span word="a">a</span> <span word="variety">variety</span> <span word="of">of</span> <span word="behaviour">behaviour</span> <span word="within">within</span> <span word="this">this</span> <span word="time">time</span>. <span word="For">For</span> <span word="some">some</span>, <span word="going">going</span> <span word="to">to</span> <span word="the">the</span> <span word="land">land</span> <span word="of">of</span> <span word="nod">nod</span> <span word="is">is</span> <span word="a">a</span> <span word="smooth">smooth</span>, <span word="quick">quick</span> <span word="journey">journey</span>, <span word="while">while</span> <span word="others">others</span> <span word="have">have</span> <span word="more">more</span> <span word="difficulty">difficulty</span>. <span word="They">They</span> “<span word="begin">begin</span> <span word="to">to</span> <span word="get">get</span> <span word="drowsy">drowsy</span>” <span word="and">and</span> <span word="then">then</span> <span word="snap">snap</span> <span word="out">out</span> <span word="of">of</span> <span word="it">it</span> “<span word="back">back</span> <span word="to">to</span> <span word="alertness">alertness</span>” <span word="he">he</span> <span word="says">says</span>.</p>
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