A lot of studies have shown it's common. Maybe not quite to the level I had, but teens in general have circadian rhythms that are shifted later. The problem o

A lot of studies have shown it's common. Maybe not quite to the level I had, but teens in general have circadian rhythms that are shifted later. The problem of course is that they make high school start earlier than middle school despite the tendency to want to rise and sleep later so that high school kids can arrive home before their possible younger elementary school siblings and watch them.