Spring fatigue is a condition that may make you feel more tired than usual during the seasonal transition from winter to spring.
“春季疲劳综合征”（春困）指的是在从冬天到春天的季节过渡期间，你会感到比平时更累的一种情况3zv3B7)%Q)。
It can also affect your concentration and appetite.
它也会影响你的注意力和食欲XMR2ZVRpd*。
It all has to do with how the body deals with the seasonal change.
这一切都与身体如何应对季节变化有关BQ7c]RF&UHm6。
Exposure to sunlight increases the brain's release of the hormone called cortisol.
暴露在阳光下会使大脑增加释放一种叫做皮质醇的荷尔蒙XczH@pLG]jHQ-e|9。
Because of this, even people who are visually impaired can tell the difference between day and night.
也正因如此，即使是视力受损的人也能分辨出白天和黑夜hKToWL|ixQ。
When the sun sets, the brain produces the sleep hormone melatonin.
当太阳落山时，大脑会产生一种名叫褪黑激素的睡眠荷尔蒙TWqx(~=R6Gd;ZUOU)K。

This is why it's more difficult to wake up after long winter nights than in the summer.
这就是为什么相比夏天，你在漫长的冬夜后醒过来要更困难]@sL76c3nKS4kuuRja。
As the season moves from winter to spring, earlier secretion of cortisol can lead to spring fatigue.
随着季节从冬天过渡到春天，皮质醇的分泌会提前，这样就导致了“春困”[f04c)Y~JNrsF0V8。
The sun rises earlier as the season moves from winter to spring.
季节由冬转春，太阳就会升起得更早!ki6%]06mDWF。
Your alarm clock is set at the same time, but the brain wakes up about 30 to 40 minutes earlier and makes you sleepy during the day.
虽然你的闹钟设定在同样的时刻，但你的大脑会提前30到40分钟醒来，这就会使得你在白天昏昏欲睡pv#zz=odW(~5hme_。
Various sources of light also blur the lines between day and night, causing sleep disturbances and resulting in more tired days.
此外，各类光源也模糊了白天和黑夜的界限，造成了睡眠障碍，导致在更多的白天你会出现身体疲惫的状况uTNNYyE(D~rgm。