I strongly agree with this article. I believe the main reason most teens are not focused in school is lack of sleep. Me personally, I know I don't get enough sleep. Mainly because of sports, homework, and friends. It would probably help most teens if they tried limiting their phone calls.
Phone calls can cause a distraction from homework and from sleeping time.
So I feel choosing a decent hour to use the phone would help with the lack of sleep. JWilliams-In response to the article about teens getting enough sleep, was a great article. I especially get enough sleep. Used under License.