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A circadian rhythm is a natural clock that helps control our bodily processes.
昼夜节律就像一个天然存在的时钟，有助于调控我们的身体。
Humans’ circadian rhythms keep track of time by detecting changes in the light.
人类身体通过探测光线的变化来记录时间，由此产生了昼夜节律。
When the sky becomes dark enough, the brain receives a signal to produce melatonin, a hormone that helps us fall asleep.
当天空变得足够暗时，大脑接收到信号，产生褪黑素。而褪黑素是一种帮助我们入睡的激素。
However, not all circadian rhythms are the same, and some people’s brains do not produce sufficient melatonin until later in the night.
然而，并不是所有人的昼夜节律都是一样的，有些人的大脑直到深夜才会产生足够的褪黑素。
People who naturally stay awake later often struggle with the work and school hours of modern society.
那些习惯晚睡的人常常很不适应现代社会的工作和学习时间安排。
Circadian rhythms can also be disrupted by unnatural light, such as the blue light that comes from screens.
昼夜节律也可能被非自然光线打乱，比如来自屏幕的蓝光。
For this reason, many people report getting less sleep than they need.
由于这个原因，许多人认为自己的睡眠时间不足。
