打鼾的人为什么不会吵醒自己?
<p>如果你有过和打鼾者共睡一室的经历，你一定有这样的感受：看着那个发出巨响的家伙幸福地睡着是多么的让人恼怒。</p><p><span word="Loud">Loud</span> <span word="snorers">snorers</span> <span word="can">can</span> <span word="wake">wake</span> <span word="themselves">themselves</span> <span word="up">up</span> <span word="with">with</span> <span word="their">their</span> <span word="own">own</span> <span word="log">log</span>-<span word="sawing">sawing</span> <span word="sounds">sounds</span>, <span word="but">but</span> <span word="only">only</span> <span word="for">for</span> <span word="a">a</span> <span word="few">few</span> <span word="seconds">seconds</span>. <span word="That">That</span>'<span word="s">s</span> <span word="why">why</span> <span word="they">they</span> <span word="may">may</span> <span word="not">not</span> <span word="be">be</span> <span word="able">able</span> <span word="to">to</span> <span word="recall">recall</span> <span word="the">the</span> <span word="sleep">sleep</span> <span word="disturbance">disturbance</span> <span word="when">when</span> <span word="they">they</span> <span word="wake">wake</span> <span word="up">up</span> <span word="the">the</span> <span word="following">following</span> <span word="morning">morning</span>, <span word="according">according</span> <span word="to">to</span> "<span word="Sleep">Sleep</span>: <span word="The">The</span> <span word="Mysteries">Mysteries</span>, <span word="The">The</span> <span word="Problems">Problems</span>, <span word="and">and</span> <span word="The">The</span> <span word="Solutions">Solutions</span>" (<span word="Penguin">Penguin</span>, 2007).</p><p>打鼾者有时会被自己拉锯般的响声弄醒，但一般也就几秒钟。按照《神秘的睡眠：问题和答案》（企鹅出版社2007年出版）的说法，这就是为什么他们第二天一早起来并不会想起自己睡眠受过有什么打扰。</p><p><span word="Snoring">Snoring</span> <span word="is">is</span> <span word="caused">caused</span> <span word="by">by</span> <span word="breathing">breathing</span> <span word="in">in</span> <span word="air">air</span> <span word="through">through</span> <span word="a">a</span> <span word="partially">partially</span> <span word="blocked">blocked</span> <span word="airway">airway</span>, <span word="according">according</span> <span word="to">to</span> <span word="the">the</span> <span word="American">American</span> <span word="Academy">Academy</span> <span word="of">of</span> <span word="Sleep">Sleep</span> <span word="Medicine">Medicine</span> (<span word="AASM">AASM</span>). <span word="When">When</span> <span word="that">that</span> <span word="happens">happens</span>, <span word="air">air</span> <span word="vibrates">vibrates</span> <span word="as">as</span> <span word="it">it</span> <span word="flows">flows</span> <span word="past">past</span> <span word="the">the</span> <span word="tissues">tissues</span> <span word="in">in</span> <span word="the">the</span> <span word="back">back</span> <span word="of">of</span> <span word="the">the</span> <span word="throat">throat</span>, <span word="which">which</span> <span word="produces">produces</span> <span word="the">the</span> <span word="snoring">snoring</span> <span word="sound">sound</span>.</p><p>美国睡眠医学院认为，打鼾是由呼吸气道中的局部堵塞造成的。当堵塞发生时，空气流经咽喉的后部会引发振动，从而发出鼾声。</p><p><span word="The">The</span> <span word="AASM">AASM</span> <span word="estimates">estimates</span> <span word="that">that</span> <span word="approximately">approximately</span> 24 <span word="percent">percent</span> <span word="of">of</span> <span word="women">women</span> <span word="and">and</span> 40 <span word="percent">percent</span> <span word="of">of</span> <span word="men">men</span> <span word="are">are</span> <span word="habitual">habitual</span> <span word="snorers">snorers</span>. <span word="Snoring">Snoring</span> <span word="is">is</span> <span word="more">more</span> <span word="common">common</span> <span word="in">in</span> <span word="those">those</span> <span word="that">that</span> <span word="are">are</span> <span word="overweight">overweight</span> <span word="because">because</span> <span word="they">they</span> <span word="tend">tend</span> <span word="to">to</span> <span word="have">have</span> <span word="more">more</span> <span word="fat">fat</span> <span word="tissue">tissue</span> <span word="in">in</span> <span word="the">the</span> <span word="back">back</span> <span word="of">of</span> <span word="the">the</span> <span word="throat">throat</span>, <span word="which">which</span> <span word="increases">increases</span> <span word="vibration">vibration</span>.</p><p>睡眠学院估计大约24%的女性和40%的男性有打鼾习惯。体胖者更易发生打鼾，因为他们咽喉后部更大，所以振动更大。</p>
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