More evidence: start school day later for teens

It seems like I have been reading for years about studies that say that teenagers perform much better in school when the starting time is pushed back. Here is another study that suggests starting the day 30 minutes later leads to “stunning” results.

It raises a question: why don’t more schools respond by changing their starting times? I’ve heard arguments about this interfering with after-school activities, particularly sports. It may conflict with schedules for siblings in schools with different starting times or may lead to a shortage of buses since early high school times mean the buses can be used again for elementary students. And there are more reasons that get thrown around, many probably legitimate.

But: if the real goal of educators (and the supporting parents) is to help students succeed in school (specifically: boost learning), isn’t this something that needs to change?