Mari Hysing and Norway Free People Check 

( I'm Mari Hysing)
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Guardian: Teenagers sleep less when they have more computer screen time says...

Investigation in Norway involving 10,000 teenagers showed more screen time means less rest and more difficulty getting to sleep

Electronic devices may keep teens from sleeping - CBS News

www.cbsnews.com
Dr. Mari Hysing, of the Regional Center for Child and Youth Mental Health and Child Welfare, Uni Research Health in Bergen, Norway, and ...
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