Doctors confirm: Screen time affects teens' sleep

SLEEPY KIDS: 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.

PARIS: Parents have long suspected it, but 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.