A new study shows electronic devices are having a negative effect on teenager's sleep cycles.

The study published in the "Science Recorder" of more than ten thousand teenagers showed that teens that use electronic devices within an hour of bed time took more than 60 minutes to fall asleep.

Doctors recommend teenagers get at least eight hours of uninterrupted sleep.  The study showed that teenagers that spent two hours online before bed averaged less than five hours a sleep a night.

Those who spent four or more hours online before bed averaged more than 60 minutes to fall asleep and received less than five hours of uninterrupted sleep.  (Metro Networks Inc.)