Researchers from Columbia University Medical Center in the US tested a method to reduce the adverse effects of evening ambient light exposure, while still allowing use of blue light-emitting devices.Smartphones, tablets and other light-emitting devices are lit by LEDs, which have a peak wavelength in the blue portion of the spectrum."It is emitted from televisions, computers, and importantly, from many light bulbs and other LED light sources that are increasingly used in our homes because they are energy-efficient and cost-effective," he said.

 But blue light does not only come from our phones.The team, led by assistant professor Ari Shechter, reasoned that selectively blocking blue light in the hours before bedtime would lead to improved sleep in individuals with insomnia.These findings, published in the journal Sleep Medicine, are consistent with prior studies showing a benefit of blue- light-blocking lenses in improving sleep, but should be replicated in larger controlled studies, Shechter said.end-ofTags: amber lenses, insomnia, sleep, blood pressure, melatonin.

Smartphones, tablets and other light-emitting devices are lit by LEDs, which have a peak wavelength in the blue portion of the spectrum.In self-reported sleep surveys, participants also reported greater duration, quality, and soundness of sleep, and an overall reduction in insomnia severity.The use of amber lenses also appeared to reduce blood pressure in the study&food factory lighting suppliers39;s participants, researchers said."I do recommend using the amber setting on smartphones at night, in addition to manually reducing the brightness levels.

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