For electronic devices like laptops, phones, anything with a LED or LCD display, the problem is that they produce a large amount of artificial blue light. Blue light is what1us to know what time of day it is. By exposing ourselves to large amounts of blue light late at night, we are giving our bodies a cue that it’s time actually to wake up instead of going to2. This can lead to the3in our circadian rhythm(昼夜节律), and it’s been shown that when we have our biological clock out of phase with the natural day-night cycle outside, that can lead to4in the rates of diabetes, cancer, heart disease.
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