每天睡多几个小时才最健康？
<p><span word="Six">Six</span> <span word="to">to</span> <span word="eight">eight</span> <span word="hours">hours</span> <span word="sleep">sleep</span> <span word="a">a</span> <span word="night">night</span> <span word="is">is</span> <span word="most">most</span> <span word="beneficial">beneficial</span> <span word="for">for</span> <span word="the">the</span> <span word="heart">heart</span>. <span word="with">with</span> <span word="more">more</span> <span word="or">or</span> <span word="less">less</span> <span word="shut">shut</span>-<span word="eye">eye</span> <span word="potentially">potentially</span> <span word="heightening">heightening</span> <span word="the">the</span> <span word="risk">risk</span> <span word="of">of</span> <span word="coronary">coronary</span> <span word="artery">artery</span> <span word="disease">disease</span> <span word="or">or</span> <span word="a">a</span> <span word="stroke">stroke</span>, <span word="researchers">researchers</span> <span word="have">have</span> <span word="warned">warned</span>.</p><p>研究人员表示，每晚六到八小时的睡眠对心脏最好，更多或更少的睡眠时间可能会增加冠状动脉病或中风的风险。</p><p><span word="Using">Using</span> <span word="data">data</span> <span word="from">from</span> <span word="more">more</span> <span word="than">than</span> <span word="one">one</span> <span word="million">million</span> <span word="adults">adults</span>, <span word="scientists">scientists</span> <span word="found">found</span> <span word="that">that</span> <span word="both">both</span> <span word="sleep">sleep</span> <span word="deprivation">deprivation</span> <span word="and">and</span> <span word="excessive">excessive</span> <span word="hours">hours</span> <span word="in">in</span> <span word="bed">bed</span> <span word="should">should</span> <span word="be">be</span> <span word="avoided">avoided</span> <span word="for">for</span> <span word="optimum">optimum</span> <span word="heart">heart</span> <span word="health">health</span>.</p><p>科学家收集了一百多万成年人的数据，发现睡眠缺失或是过多睡眠都对心脏不好。</p><p><span word="Compared">Compared</span> <span word="to">to</span> <span word="adults">adults</span> <span word="who">who</span> <span word="got">got</span> <span word="six">six</span> <span word="to">to</span> <span word="eight">eight</span> <span word="hours">hours</span> <span word="of">of</span> <span word="slumber">slumber</span> <span word="a">a</span> <span word="night">night</span>, "<span word="short">short</span> <span word="sleepers">sleepers</span>" <span word="had">had</span> <span word="an">an</span> 11 <span word="per">per</span> <span word="cent">cent</span> <span word="greater">greater</span> <span word="risk">risk</span> <span word="while">while</span> "<span word="long">long</span> <span word="sleepers">sleepers</span>" <span word="had">had</span> <span word="a">a</span> 33 <span word="per">per</span> <span word="cent">cent</span> <span word="increased">increased</span> <span word="risk">risk</span> <span word="over">over</span> <span word="the">the</span> <span word="next">next</span> <span word="nine">nine</span> <span word="years">years</span>, <span word="the">the</span> <span word="researchers">researchers</span> <span word="said">said</span>.</p><p>研究人员通过比较成年人的睡眠时间，发现少于六小时的睡眠会在未来九年为心脏额外带来11%的风险，而睡眠过多导致的患心脏病风险增加33%。</p><p>"<span word="More">More</span> <span word="research">research</span> <span word="is">is</span> <span word="needed">needed</span> <span word="to">to</span> <span word="clarify">clarify</span> <span word="exactly">exactly</span> <span word="why">why</span>, <span word="but">but</span> <span word="we">we</span> <span word="do">do</span> <span word="know">know</span> <span word="that">that</span> <span word="sleep">sleep</span> <span word="influences">influences</span> <span word="biological">biological</span> <span word="processes">processes</span> <span word="like">like</span> <span word="glucose">glucose</span> <span word="metabolism">metabolism</span>, <span word="blood">blood</span> <span word="pressure">pressure</span>, <span word="and">and</span> <span word="inflammations">inflammations</span> – <span word="all">all</span> <span word="of">of</span> <span word="which">which</span> <span word="have">have</span> <span word="an">an</span> <span word="impact">impact</span> <span word="on">on</span> <span word="cardiovascular">cardiovascular</span> <span word="disease">disease</span>."</p><p>“需要做更多的研究才能解释其中的原因，但是我们都知道睡眠会影响葡萄糖代谢、血压、炎症这样的生理过程，而这些都会导致心血管疾病。”</p>
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