Scrolling on your smartphone is keeping you from getting a good night’s sleep — and it’s not just because you’re staying up late. It’s also because of the blue light used by the phone. The study measured the sleep of 68 male participants over a period of two weeks, who read for 90 minutes from a printed book, from a smartphone with a blue light filter on — and from a smartphone without a blue light filter on. Also, the older you are, the stronger the effect of the blue light on your melatonin levels. “Adolescents demonstrate a more rapid recovery from the melatonin suppression than young adults do “Light strongly affects circadian rhythms. Morning light strikes the retina of your eye and sets up a chain of circadian hormonal reactions that signal the body to begin daytime alerting processes “Nighttime smartphone reading does not appear to interfere with whole-night sleep…if the smartphone is put away 1 h before bedtime,” the study said. “It is advisable for adolescents and young adults to avoid exposure to LED screens in the last hour before bedtime, which is in line with general sleep hygiene recommendations
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Tuesday, May 20, 2025