What is the "this" that you don't agree with? The theorized causality? It's not a question of whether the kids in the Seattle study slept more or not. They did

What is the "this" that you don't agree with? The theorized causality? It's not a question of whether the kids in the Seattle study slept more or not. They did sleep more. The question is why, and I think most people agree that it is clearly because of the later school start time.