Reading an e-book at night could damage your health, US doctors have warned.
Twelve people spent two weeks inside a week laboratory – and split their time evenly reading from paperback and an iPad.
A team from Harvard Medical School, which held the experiment, took regular blood sample from participants.
They found that the production of sleep hormone melatonin was reduced by reading an e-book
But feeling tired the following day may not be the only by-product of exposure to blue light at night time.
Sleep deficiency has been linked to cardiovascular disease, diabetes, and cancer.
Lead researcher Prof Charles Czeisler told the BBC: ‘The light emitted by most e-readers is shining directly into the eyes of the reader, whereas from a printed book or the original Kindle, the reader is only exposed to reflected light from the pages of the book.
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