Blue light is emitted by such electronics as smartphones, laptops, televisions, and tablets, and using these devices late in the evening can have negative effects on our circadian rhythms. The blue light tricks our brains into believing that it’s still light outside and therefore still daytime, and lowers the sleep hormone melatonin.
To maintain melatonin levels and to allow for better sleep, you can wear blue light blocking glasses, change the display settings on your devices to a warmer hue or avoid all device use at least two hours before bed.