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Smartphones and e-readers may lead to poorer health

If you curl up under the duvet with an e-book for a bedtime read then you are damaging your sleep and maybe your health, a team from Harvard Medical School have warned.

They found it took longer to nod off with a back-lit e-reader, which led to poorer quality sleep and being more tired the next morning.  Consequently, experts said people should minimise light-exposure in the evening.

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.  Also, blue light in the evening can slow or prevent the production of the sleep hormone melatonin.

To read the full article, please click here.

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