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一場(chǎng)大雪讓很多北方城市都提前進(jìn)入冬季。因?yàn)樘鞖夂洌芏嗳硕荚敢庹诩依铮€有人會(huì)因?yàn)闀兌桃归L(zhǎng)而有些情緒波動(dòng)。這個(gè)冬季，你憂(yōu)郁了嗎？

Seasonal affective disorder (SAD) is a type of depression that sets in or starts in the winter months. Unlike other types of depression, it may improve as spring comes on. It is often a cyclical, recurring disorder--you'll feel depression every winter and begin to feel better each spring.

季節(jié)性情緒紊亂（seasonal affective disorder，SAD）指多發(fā)于冬季的一種抑郁癥，也稱(chēng)“冬季抑郁癥”。與其它類(lèi)型的抑郁癥不同的是，這種季節(jié)性抑郁癥會(huì)在春天到來(lái)時(shí)有所好轉(zhuǎn)。這是一種循環(huán)的、反復(fù)發(fā)生的情緒紊亂，每年冬天時(shí)覺(jué)得抑郁，春天到來(lái)時(shí)又好轉(zhuǎn)了。

A study by Alfred Lewy at the Oregon Health and Science University found that most of the symptoms of seasonal affective disorder are caused by body rhythms that are not in sync with the sun. Often the body gets out of sync with the sun because of winter's shortened days. The pineal gland, which regulates body rhythms, secretes a hormone called melatonin during the night. This can affect your sleep wake cycle and other rhythms. When it gets dark too early in the day, the pineal gland and the body's sleep wake cycle get out of sync.

俄勒岡健康與科學(xué)大學(xué)的阿爾弗雷德?洛威所做的一項(xiàng)研究發(fā)現(xiàn)，季節(jié)性情緒紊亂的大部分癥狀是由身體節(jié)律與太陽(yáng)不同步導(dǎo)致的。通常來(lái)說(shuō)，身體會(huì)因?yàn)槎景滋熳兌潭鵁o(wú)法與太陽(yáng)同步。控制身體節(jié)律的松果體會(huì)在夜間分泌一種叫做褪黑素的激素。這種激素會(huì)影響你的作息周期和其它節(jié)律。天黑得太早時(shí)，松果體和身體的作息周期就無(wú)法同步。

Seasonal affective disorder is far more common in northern climates, where days can be very short in winter. SAD affects more women than men and is likelier to occur in people under age 40 than those older than that.

季節(jié)性情緒紊亂在北方氣候地區(qū)更常見(jiàn)，北方冬季的白天都很短。該癥狀的女性患者多于男性，而且更易發(fā)生在40歲以下人群中。

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