Does screen time before bed really affect sleep?
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3 Answers
Yes, through two mechanisms: blue light delaying melatonin, and — usually more important — mental stimulation and time displacement. Night mode alone doesn't solve it; reducing engaging content in the last hour matters more.
Night mode reduces blue light modestly, but the stimulation from content — messages, work, news, video — usually affects sleep more than the light spectrum does.
The more effective change is what you do in the last hour, not the colour temperature of the screen.
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