Blame it on the early school start time and their circadian rhythms: the mental and physical changes that occur in a day. Teenagers need eight to 10 hours of sleep, compared with the six to eight ...

The National Sleep Foundation recommends getting seven to nine hours of sleep each night, but only 6.3% of University of Minnesota Morris students report accomplishing that on a regular basis.

Hazel Price: $199.99 Amazon Promising review: "This works AWESOME. And my husband absolutely loves it. I bought this for him ...

They also found no significant link between time spent using a screen and the choice of activity -- social media or movies -- ...