为什么睡过头反而更疲倦?
<p><span word="We">We</span>’<span word="ve">ve</span> <span word="all">all</span> <span word="been">been</span> <span word="there">there</span>: <span word="It">It</span>’<span word="s">s</span> <span word="been">been</span> <span word="a">a</span> <span word="long">long</span> <span word="week">week</span> <span word="at">at</span> <span word="work">work</span>, <span word="so">so</span> <span word="Friday">Friday</span> <span word="night">night</span>, <span word="you">you</span> <span word="reward">reward</span> <span word="yourself">yourself</span> <span word="by">by</span> <span word="going">going</span> <span word="to">to</span> <span word="bed">bed</span> <span word="early">early</span> <span word="and">and</span> <span word="sleeping">sleeping</span> <span word="in">in</span>. <span word="But">But</span> <span word="when">when</span> <span word="you">you</span> <span word="wake">wake</span> <span word="up">up</span> <span word="the">the</span> <span word="next">next</span> <span word="morning">morning</span> (<span word="or">or</span> <span word="afternoon">afternoon</span>), <span word="light">light</span> <span word="scathes">scathes</span> <span word="your">your</span> <span word="eyes">eyes</span>, <span word="and">and</span> <span word="your">your</span> <span word="limbs">limbs</span> <span word="feel">feel</span> <span word="like">like</span> <span word="they">they</span>’<span word="re">re</span> <span word="filled">filled</span> <span word="with">with</span> <span word="sand">sand</span>. <span word="Your">Your</span> <span word="brain">brain</span> <span word="is">is</span> <span word="still">still</span> <span word="lying">lying</span> <span word="down">down</span> <span word="and">and</span> <span word="you">you</span> <span word="even">even</span> <span word="have">have</span> <span word="faint">faint</span> <span word="headache">headache</span>. <span word="If">If</span> <span word="too">too</span> <span word="little">little</span> <span word="sleep">sleep</span> <span word="is">is</span> <span word="a">a</span> <span word="problem">problem</span>, <span word="then">then</span> <span word="why">why</span> <span word="is">is</span> <span word="extra">extra</span> <span word="sleep">sleep</span> <span word="a">a</span> <span word="terrible">terrible</span> <span word="solution">solution</span>?</p><p>我们都有过这种体验：辛劳工作了漫长的一周后，为了好好犒劳自己，周五早早上床，然后睡个自然醒。但是第二天一大早（或者一觉睡到下午）起床的时候，只觉得阳光刺眼，四肢像灌了铅一样。大脑昏昏沉沉，甚至感觉头部隐隐作痛。如果睡得太少是个问题的话，那么为什么睡多了也那么糟糕？</p><p><span word="Oversleeping">Oversleeping</span> <span word="feels">feels</span> <span word="so">so</span> <span word="much">much</span> <span word="like">like</span> <span word="a">a</span> <span word="hangover">hangover</span> <span word="that">that</span> <span word="scientists">scientists</span> <span word="call">call</span> <span word="it">it</span> <span word="sleep">sleep</span> <span word="drunkenness">drunkenness</span>. <span word="But">But</span>, <span word="unlike">unlike</span> <span word="the">the</span> <span word="brute">brute</span> <span word="force">force</span> <span word="neurological">neurological</span> <span word="damage">damage</span> <span word="caused">caused</span> <span word="by">by</span> <span word="alcohol">alcohol</span>, <span word="your">your</span> <span word="misguided">misguided</span> <span word="attempt">attempt</span> <span word="to">to</span> <span word="stock">stock</span> <span word="up">up</span> <span word="on">on</span> <span word="rest">rest</span> <span word="makes">makes</span> <span word="you">you</span> <span word="feel">feel</span> <span word="sluggish">sluggish</span> <span word="by">by</span> <span word="confusing">confusing</span> <span word="the">the</span> <span word="part">part</span> <span word="of">of</span> <span word="your">your</span> <span word="brain">brain</span> <span word="that">that</span> <span word="controls">controls</span> <span word="your">your</span> <span word="body">body</span>’<span word="s">s</span> <span word="daily">daily</span> <span word="cycle">cycle</span>.</p><p>睡过头的感觉跟宿醉之后的感觉极为相似，科学家们称之为“睡醉”。但是，与酒精对神经系统所造成的强烈损伤不同，睡过头这种错误行径所导致的身体行动迟缓，是由于控制身体日常循环的那部分大脑神经被混乱的作息混淆所导致的。</p><p><span word="Your">Your</span> <span word="internal">internal</span> <span word="rhythms">rhythms</span> <span word="are">are</span> <span word="set">set</span> <span word="by">by</span> <span word="your">your</span> <span word="circadian">circadian</span> <span word="pacemaker">pacemaker</span>, <span word="a">a</span> <span word="group">group</span> <span word="of">of</span> <span word="cells">cells</span> <span word="clustered">clustered</span> <span word="in">in</span> <span word="the">the</span> <span word="hypothalamus">hypothalamus</span>, <span word="a">a</span> <span word="primitive">primitive</span> <span word="little">little</span> <span word="part">part</span> <span word="of">of</span> <span word="the">the</span> <span word="brain">brain</span> <span word="that">that</span> <span word="also">also</span> <span word="controls">controls</span> <span word="hunger">hunger</span>, <span word="thirst">thirst</span>, <span word="and">and</span> <span word="sweat">sweat</span>. <span word="Primarily">Primarily</span> <span word="triggered">triggered</span> <span word="by">by</span> <span word="light">light</span> <span word="signals">signals</span> <span word="from">from</span> <span word="your">your</span> <span word="eye">eye</span>, <span word="the">the</span> <span word="pacemaker">pacemaker</span> <span word="figures">figures</span> <span word="out">out</span> <span word="when">when</span> <span word="it">it</span>’<span word="s">s</span> <span word="morning">morning</span> <span word="and">and</span> <span word="sends">sends</span> <span word="out">out</span> <span word="chemical">chemical</span> <span word="messages">messages</span> <span word="keeping">keeping</span> <span word="the">the</span> <span word="rest">rest</span> <span word="of">of</span> <span word="the">the</span> <span word="cells">cells</span> <span word="in">in</span> <span word="your">your</span> <span word="body">body</span> <span word="on">on</span> <span word="the">the</span> <span word="same">same</span> <span word="clock">clock</span>.</p>
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