Watching TV or using computers, tablets or smartphones after dark may cause sleep loss and resultant health problems, a leading doctor has warned. Peering at brightly lit screens at night disrupts the body's natural rhythms and raises the risk of medical conditions linked to poor sleep, including obesity, heart disease, strokes and depression, he said.
read more: http://www.theguardian.com/science/2013/may/22/peering-bright-screens-dark-harm-health
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