有些人睡眠少身体棒？原来是基因决定的
<p>白天时间不够用，晚上睡眠不好？但现实生活中，确实有些人每天睡眠时间很短，却精神饱满。为什么有些人每天只需要睡4、5个小时？这其实是由基因决定的。</p><p><span word="A">A</span> <span word="genetic">genetic</span> <span word="mutation">mutation</span> <span word="that">that</span> <span word="allows">allows</span> <span word="people">people</span> <span word="to">to</span> <span word="feel">feel</span> <span word="fully">fully</span> <span word="rested">rested</span> <span word="with">with</span> <span word="fewer">fewer</span> <span word="than">than</span> <span word="six">six</span> <span word="hours">hours</span> <span word="sleep">sleep</span> <span word="a">a</span> <span word="night">night</span> <span word="has">has</span> <span word="been">been</span> <span word="identified">identified</span> <span word="by">by</span> <span word="studying">studying</span> <span word="a">a</span> <span word="family">family</span> <span word="who">who</span> <span word="get">get</span> <span word="by">by</span> <span word="on">on</span> <span word="less">less</span> <span word="than">than</span> <span word="average">average</span>. <span word="It">It</span> <span word="is">is</span> <span word="the">the</span> <span word="second">second</span> <span word="such">such</span> <span word="finding">finding</span> <span word="in">in</span> <span word="recent">recent</span> <span word="months">months</span>.</p><p>科学家通过对一个家庭的研究，发现了一种可以使人在每晚睡眠不足6小时的情况下得到充分休息的基因突变。这个家庭的成员每日睡眠时长低于平均水平。这是近几个月来第二个针对这一问题的同类发现。</p>
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