Sleep is important, but this article is kinda useless in itself. First, yes, sure, of course sleep matters. But also it's measuring association, not causation.

Sleep is important, but this article is kinda useless in itself. First, yes, sure, of course sleep matters. But also it's measuring association, not causation. It's easy to think of reasons it works in reverse: of course people with good grades sleep better, they don't worry about having poor grades. And it's even saying that " Sleep measures accounted for nearly 25% of the variance in academic performance". That's causation language, and I don't think they determined that.