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What's Hot in Nutrition, Dietary Supplements, Health and Wellness Today

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What's Hot in Nutrition, Dietary Supplements, Health and Wellness Today

Nighttime electronic device use lowers melatonin levels

Nighttime electronic device use lowers melatonin levelsDecember 24 2014. On December 22, 2014, the Proceedings of the National Academy of Science published the findings researchers at Boston's Brigham and Women's Hospital of a suppressive effect for evening use of light-emitting electronic devices on sleep and melatonin secretion.

"Electronic devices emit light that is short-wavelength-enriched light, which has a higher concentration of blue light -- with a peak around 450 nm -- than natural light," explained lead author Anne-Marie Chang. "This is different from natural light in composition, having a greater impact on sleep and circadian rhythms."

Twelve healthy adults were randomized to read a light-emitting eBook or a printed book in dim room light approximately four hours before bedtime for five evenings. At the end of the five day period, participants switched their assignments. Blood samples collected during portions of the study were analyzed for melatonin levels.  Sleep latency, time and efficiency were assessed via polysomnography.

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