1) The study doesn't conclude what the parent was claiming and what you seem to think it's claiming. 2) It's only for high school students and its sample is pretty small. 3) It actually supports my point of enough sleep more than anything else which seems to be completely ignored of course. 4) Here is my evidence https://www.aei.org/carpe-diem/more-on-the-phenomenal-eye-po... my sons are Success Academy.

What do you suggest I conclude from that?

5) Just saying something is science isn't enough and just saying it's science because someone did some studies isn't enough either. I read through the paper and it wasn't even close to being anything but a very small sample especially when you factor in that two different schools yielded two different results. So perhaps rather than just scream science, it would help if people took a deep breath and looked into what they hold in front of them as science cause that wasn't it.

6) I was responding to a claim about not being fully awake in the morning with a simple observation that if you go to bed early you are not going to be tired in the morning. That was then challenged with a completely new challenge which was that kids perform better when they are in school later to which I know for a fact that's not true and from the article you are referencing that's not what's being said either.