Besides being an appeal to authority, this is directly addressed in the piece: https://guzey.com/books/why-we-sleep/#appendix-common-object...

> ...it was read by hundreds of psychologists and neuroscientists who – I believe – also failed to find any serious issues [...] Some of the scientists wrote to me directly [including] a sleep scientist with >50 h-index who studied sleep for more than 40 years

This isn't some crackpot questioning the scientific consensus of an entire field of study. It's a critique of specific contents of a single piece of work.

Given that pop sci publications have a history of being slippery with the truth, and given the financial incentive to make millions off a pop sci book, and given that the claims made in the blog post are easily confirmed and checked, this appeal to authority that you've made is misplaced.