I'd argue that regardless of the author's motive, as a layperson, it's a good book because it's easy to read and started me down the path of exploring my sleep

I'd argue that regardless of the author's motive, as a layperson, it's a good book because it's easy to read and started me down the path of exploring my sleep in-depth. My take away from the book is, like so many other biological functions, we still don't really know why we sleep but we know sleep is important. Learn more if you want to, learn about why this book could be considered controversial but for most people the takeaway of "sleep good" is what matters.