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Researchers at Rensselaer Polytechnic Institute showed that exposure to light from computer tablets significantly lowered levels of the hormone melatonin, which regulates our internal clocks and plays a role in the sleep cycle. In the study, published in the journal Applied Ergonomics, the researchers had volunteers read, play games and watch movies on an iPad, iPad 2 or PC tablet for various amounts of time while measuring the amount of light their eyes received.
They found that two hours of exposure to a bright tablet screen at night reduced melatonin levels by about 22%.
