新概念优美背诵短文50篇:睡眠
<p><span word="Sleep">Sleep</span> 睡眠</p><p><span word="Sleep">Sleep</span> <span word="is">is</span> <span word="part">part</span> <span word="of">of</span> <span word="a">a</span> <span word="persons">persons</span> <span word="daily">daily</span> <span word="activity">activity</span> <span word="cycle">cycle</span>. <span word="There">There</span> <span word="are">are</span> <span word="several">several</span> <span word="different">different</span> <span word="stages">stages</span> <span word="of">of</span> <span word="sleep">sleep</span>, <span word="and">and</span> <span word="they">they</span> <span word="too">too</span> <span word="occur">occur</span> <span word="in">in</span> <span word="cycles">cycles</span>. 睡眠是人每天日常活动循环的一部分。人的睡眠分几个阶段，而这些阶段也是循环发生的。</p><p><span word="If">If</span> <span word="you">you</span> <span word="are">are</span> <span word="an">an</span> <span word="average">average</span> <span word="sleeper">sleeper</span>, <span word="your">your</span> <span word="sleep">sleep</span> <span word="cycle">cycle</span> <span word="is">is</span> <span word="as">as</span> <span word="follows">follows</span>. <span word="When">When</span> <span word="you">you</span> <span word="first">first</span> <span word="drift">drift</span> <span word="off">off</span> <span word="into">into</span> <span word="slumber">slumber</span>, <span word="your">your</span> <span word="eyes">eyes</span> <span word="will">will</span> <span word="roll">roll</span> <span word="about">about</span> <span word="a">a</span> <span word="bit">bit</span>, <span word="your">your</span> <span word="temperature">temperature</span> <span word="will">will</span> <span word="drop">drop</span> <span word="slightly">slightly</span>, <span word="your">your</span> <span word="muscles">muscles</span> <span word="will">will</span> <span word="relax">relax</span>, <span word="and">and</span> <span word="your">your</span> <span word="breathing">breathing</span> <span word="well">well</span> <span word="slow">slow</span> <span word="and">and</span> <span word="become">become</span> <span word="quite">quite</span> <span word="regular">regular</span>. <span word="Your">Your</span> <span word="brain">brain</span> <span word="waves">waves</span> <span word="slow">slow</span> <span word="down">down</span> <span word="a">a</span> <span word="bit">bit</span> <span word="too">too</span>, <span word="with">with</span> <span word="the">the</span> <span word="alpha">alpha</span> <span word="rhythm">rhythm</span> <span word="of">of</span> <span word="rather">rather</span> <span word="fast">fast</span> <span word="waves">waves</span> <span word="predominating">predominating</span> <span word="for">for</span> <span word="the">the</span> <span word="first">first</span> <span word="few">few</span> <span word="minutes">minutes</span>. <span word="This">This</span> <span word="is">is</span> <span word="called">called</span> <span word="stage">stage</span> 1 <span word="sleep">sleep</span>. <span word="For">For</span> <span word="the">the</span> <span word="next">next</span> <span word="half">half</span> <span word="hour">hour</span> <span word="or">or</span> <span word="so">so</span>, <span word="as">as</span> <span word="you">you</span> <span word="relax">relax</span> <span word="more">more</span> <span word="and">and</span> <span word="more">more</span>, <span word="you">you</span> <span word="will">will</span> <span word="drift">drift</span> <span word="down">down</span> <span word="through">through</span> <span word="stage">stage</span> 2 <span word="and">and</span> <span word="stage">stage</span> 3 <span word="sleep">sleep</span>. <span word="The">The</span> <span word="lower">lower</span> <span word="your">your</span> <span word="stage">stage</span> <span word="of">of</span> <span word="sleep">sleep</span>, <span word="the">the</span> <span word="slower">slower</span> <span word="your">your</span> <span word="brain">brain</span> <span word="waves">waves</span> <span word="will">will</span> <span word="be">be</span>. <span word="Then">Then</span> <span word="about">about</span> 40 <span word="to">to</span> 60 <span word="minutes">minutes</span> <span word="after">after</span> <span word="you">you</span> <span word="lose">lose</span> <span word="consciousness">consciousness</span> <span word="you">you</span> <span word="will">will</span> <span word="have">have</span> <span word="reached">reached</span> <span word="the">the</span> <span word="deepest">deepest</span> <span word="sleep">sleep</span> <span word="of">of</span> <span word="all">all</span>. <span word="Your">Your</span> <span word="brain">brain</span> <span word="waves">waves</span> <span word="will">will</span> <span word="show">show</span> <span word="the">the</span> <span word="large">large</span> <span word="slow">slow</span> <span word="waves">waves</span> <span word="that">that</span> <span word="are">are</span> <span word="known">known</span> <span word="as">as</span> <span word="the">the</span> <span word="delta">delta</span> <span word="rhythm">rhythm</span>. <span word="This">This</span> <span word="is">is</span> <span word="stage">stage</span> 4 <span word="sleep">sleep</span>. 如果你是一个正常的睡眠者，你的睡眠循环会这样进行。在你开始昏昏入睡时，你的眼睛会滚动几下，体温略有下降，肌肉放松，呼吸变得缓慢而有节奏。除了开始几分钟比较快的节奏外，脑电波也稍有减缓。这被称为第一阶段睡眠。在随后约半小时内，你进一步放松，进入第二和第三阶段睡眠。睡眠越深入，脑电波就越缓慢。大约在开始睡眠后的40到60分钟，你将进入沉睡状态。这时的脑电波表现为巨大的缓波，被称为节奏。这就是第四阶段睡眠。</p>
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