Does your teen stay up until the wee hours and have trouble getting up in the morning? While it may just be normal teenage behavior, leading doctors say parents need to wake up to another possibility: Delayed Sleep Phase Syndrome. It's a little known sleep disorder that's estimated to affect anywhere from 360,000 to several million teens and young adults. Experts say kids with this condition are often misdiagnosed with things like depression and attention deficit disorder and frequently have trouble in school. We'll tell you how to determine whether your teen has this sleep sickness