E-books ‘damage sleep and health,’ doctors warn

Our bodies are kept in tune with the rhythm of day and night by an internal body clock, which uses light to tell the time.

But blue light, the wavelength common in smartphones, tablets and LED lighting, is able to disrupt the body clock.

Blue light in the evening can slow or prevent the production of the sleep hormone melatonin.

http://www.bbc.com/news/health-30574260

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