I'd guess this

https://statmodeling.stat.columbia.edu/2019/12/27/why-we-sle...

I did too, and it turns out a lot of the claims are either made up (the literature doesn't support the claims, or doesn't seem to exist at all!), potentially harmful or misleading (modified plots to suit the narrative).

In hindsight some of the claims are just weird, like saying you can measure the effect of one bad night's sleep months down the line.

On the whole it got people talking about sleep, which isn't a bad thing. But, the peer review (see sibling posts) only looked at one chapter I think, so God knows what else is wrong.

I don't think anyone is doubting that you should probably get a bit more sleep, try not to blast blue lights in your face and get into a routine. Standard sleep hygiene stuff.

There have been a few discussions about it on HN as well, where Alexey Guyzey, author of the criticism linked, joins in on the conversation:

(4 months ago) https://news.ycombinator.com/item?id=21546850

(1 month ago) https://news.ycombinator.com/item?id=22419958