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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。
It can also affect your concentration and appetite.
它也会影响你的注意力和食欲。
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。
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。
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。
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。
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。
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”。
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。
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。
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。
