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February 2, 2015 10:36 PM EST

Maybe they should be dubbed Generation-Zzzz.

Teens who bury their faces for hours on end in laptops, tablets, smart phones or TV screens during the days tend to suffer bad nights of sleep, researchers reported Monday.

“There are indications that today’s teenagers sleep less than previous generations,” said Mari Hysing, co-author and a psychologist at Uni Research Health in Norway. “There are some aspects of electronic devices that may give an additional arousal; the [screen] light may impact sleep hormone production, and also the social communication aspect” may stir adolescents to keep chatting deep into the night …

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