Young people are supposed to get a good 8-10 hours each night.
TVs blamed
But the researchers said many children have missed out on 4,500 vital hours of shut-eye by the time they are age seven.
Fact File
Sleepy facts
Most people toss and turn 40-60 times a night
One hour less sleep a night can effect you 25% the next day
It should take you 15-20 mins to fall asleep if you are getting enough
The loudest snore is 90 decibels - louder than city traffic!
And they blamed this on the fact that most kids have TVs and computers in their rooms, and that busy parents don't read to their younger kids at night anymore.
Children with TVs and other devices in their bedrooms were more likely to get a bad night's sleep, and more likely to get less than eight hours.
Even losing an hour's sleep a night can really hit a child's performance at school and effect their development, they found.
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