The sentiment is so often-repeated that it feels like common sense: the blue light from your phone tricks your brain into staying awake when you should be sleeping, and is more likely to suppress sleep hormone melatonin than, e.g., yellow light.
For that reason, some phones have a “night mode” which turns the colour of your screen warmer in the hours before your bedtime. Many sleep experts advise steering clear of screens at night altogether.
But this finding isn’t as consistent as you might think. The BBC recently Read Entire Article
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