The USA Today points to an important study that links teenagers lack of sleep to depression/suicidal thoughts:

The findings are the first to examine bedtimes’ effects on kids’ mental health — and the results are noteworthy. Middle- and high-schoolers whose parents don’t require them to be in bed before midnight on school nights are 42% more likely to be depressed than teens whose parents require a 10 p.m. or earlier bedtime. And teens who are allowed to stay up late are 30% more likely to have had suicidal thoughts in the past year.

In a world of Facebook, Twitter, ESPN.com, and text-messaging, we need to be very careful to discipline ourselves to get enough sleep!  You might not be able to see a difference in your mood and attitude, but others can!