Dick Uliano, wtop.com
WASHINGTON - Many teenagers keep their cellphones near their beds at night, not just for the alarm clock but so they'll be accessible if their friends try to reach them.
Texting is the preferred way of communicating.
But Japanese researchers, writing in the Journal of Pediatric Psychology, say they've uncovered a risk.
They say they've found links between adolescents who use their phones after going to bed and poor mental health, suicidal thoughts and self-injury compared to adolescents who didn't use their phones late at night.
The researchers say their study ruled out other factors including alcohol and drug use as possible causes of the increased risk.
The study analyzed completed questionnaires by nearly 18,000 adolescents in grades 7-12.
Follow WTOP on Twitter.
(Copyright 2012 by WTOP. All Rights Reserved.)
How much did a painting of a topless "Golden Girl" fetch?
Emma Watson revels in her post-"Potter" freedom at Cannes.
How did a photographer get an inside view of a bear's mouth? (Video)
An 800-pound alligator? That's not bad for a first hunting trip.