Doctors: Screen time affects teens' sleep.
Those with screen time of more than four hours per day were three and a half times likelier to sleep fewer than five hours at night a probe found.
Now doctors have proof: the more time teenagers spend on computers or mobile phones, the less they sleep -- especially if the gadget is used just before bedtime.The evidence is so strong, the experts said, that health watchdogs should overhaul guidelines for electronic device use by youngsters.
The team carried out an investigation among nearly 10,000 people aged 16 to 19 in Hordaland county, western Norway.The teens were questioned about their sleeping patterns, how long they looked at a screen outside of school hours and the type of gadget they used.
One is quite simple: that teenagers are getting to bed later -- screen time eats into sleep time. There could also be muscle pains, tension or headaches, for instance from playing a game for too long.
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