一到冬季就“抑郁”？
<p> 一场大雪让很多北方城市都提前进入冬季。因为天气寒冷，很多人都愿意宅在家里，还有人会因为昼短夜长而有些情绪波动。这个冬季，你忧郁了吗？</p><p> </p><p> <span word="Seasonal">Seasonal</span> <span word="affective">affective</span> <span word="disorder">disorder</span> (<span word="SAD">SAD</span>) <span word="is">is</span> <span word="a">a</span> <span word="type">type</span> <span word="of">of</span> <span word="depression">depression</span> <span word="that">that</span> <span word="sets">sets</span> <span word="in">in</span> <span word="or">or</span> <span word="starts">starts</span> <span word="in">in</span> <span word="the">the</span> <span word="winter">winter</span> <span word="months">months</span>. <span word="Unlike">Unlike</span> <span word="other">other</span> <span word="types">types</span> <span word="of">of</span> <span word="depression">depression</span>, <span word="it">it</span> <span word="may">may</span> <span word="improve">improve</span> <span word="as">as</span> <span word="spring">spring</span> <span word="comes">comes</span> <span word="on">on</span>. <span word="It">It</span> <span word="is">is</span> <span word="often">often</span> <span word="a">a</span> <span word="cyclical">cyclical</span>, <span word="recurring">recurring</span> <span word="disorder">disorder</span>--<span word="you">you</span>'<span word="ll">ll</span> <span word="feel">feel</span> <span word="depression">depression</span> <span word="every">every</span> <span word="winter">winter</span> <span word="and">and</span> <span word="begin">begin</span> <span word="to">to</span> <span word="feel">feel</span> <span word="better">better</span> <span word="each">each</span> <span word="spring">spring</span>.</p><p> 季节性情绪紊乱（<span word="seasonal">seasonal</span> <span word="affective">affective</span> <span word="disorder">disorder</span>，<span word="SAD">SAD</span>）指多发于冬季的一种抑郁症，也称“冬季抑郁症”。与其它类型的抑郁症不同的是，这种季节性抑郁症会在春天到来时有所好转。这是一种循环的、反复发生的情绪紊乱，每年冬天时觉得抑郁，春天到来时又好转了。</p><p> <span word="A">A</span> <span word="study">study</span> <span word="by">by</span> <span word="Alfred">Alfred</span> <span word="Lewy">Lewy</span> <span word="at">at</span> <span word="the">the</span> <span word="Oregon">Oregon</span> <span word="Health">Health</span> <span word="and">and</span> <span word="Science">Science</span> <span word="University">University</span> <span word="found">found</span> <span word="that">that</span> <span word="most">most</span> <span word="of">of</span> <span word="the">the</span> <span word="symptoms">symptoms</span> <span word="of">of</span> <span word="seasonal">seasonal</span> <span word="affective">affective</span> <span word="disorder">disorder</span> <span word="are">are</span> <span word="caused">caused</span> <span word="by">by</span> <span word="body">body</span> <span word="rhythms">rhythms</span> <span word="that">that</span> <span word="are">are</span> <span word="not">not</span> <span word="in">in</span> <span word="sync">sync</span> <span word="with">with</span> <span word="the">the</span> <span word="sun">sun</span>. <span word="Often">Often</span> <span word="the">the</span> <span word="body">body</span> <span word="gets">gets</span> <span word="out">out</span> <span word="of">of</span> <span word="sync">sync</span> <span word="with">with</span> <span word="the">the</span> <span word="sun">sun</span> <span word="because">because</span> <span word="of">of</span> <span word="winter">winter</span>'<span word="s">s</span> <span word="shortened">shortened</span> <span word="days">days</span>. <span word="The">The</span> <span word="pineal">pineal</span> <span word="gland">gland</span>, <span word="which">which</span> <span word="regulates">regulates</span> <span word="body">body</span> <span word="rhythms">rhythms</span>, <span word="secretes">secretes</span> <span word="a">a</span> <span word="hormone">hormone</span> <span word="called">called</span> <span word="melatonin">melatonin</span> <span word="during">during</span> <span word="the">the</span> <span word="night">night</span>. <span word="This">This</span> <span word="can">can</span> <span word="affect">affect</span> <span word="your">your</span> <span word="sleep">sleep</span> <span word="wake">wake</span> <span word="cycle">cycle</span> <span word="and">and</span> <span word="other">other</span> <span word="rhythms">rhythms</span>. <span word="When">When</span> <span word="it">it</span> <span word="gets">gets</span> <span word="dark">dark</span> <span word="too">too</span> <span word="early">early</span> <span word="in">in</span> <span word="the">the</span> <span word="day">day</span>, <span word="the">the</span> <span word="pineal">pineal</span> <span word="gland">gland</span> <span word="and">and</span> <span word="the">the</span> <span word="body">body</span>'<span word="s">s</span> <span word="sleep">sleep</span> <span word="wake">wake</span> <span word="cycle">cycle</span> <span word="get">get</span> <span word="out">out</span> <span word="of">of</span> <span word="sync">sync</span>.</p><p> 俄勒冈健康与科学大学的阿尔弗雷德•洛威所做的一项研究发现，季节性情绪紊乱的大部分症状是由身体节律与太阳不同步导致的。通常来说，身体会因为冬季白天变短而无法与太阳同步。控制身体节律的松果体会在夜间分泌一种叫做褪黑素的激素。这种激素会影响你的作息周期和其它节律。天黑得太早时，松果体和身体的作息周期就无法同步。</p>
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