There are several different ideas that are very insufficiently sourced: magnesium as a valuable supplement when not deficient, cellphone radiation affecting sleep. I cross-checked the sources and MANY were from blog posts or led me to a dead site or dot coms. One was from honest-to-god the Daily Mail.

There are—admittedly—breadcrumbs here and there of ideas that are of merit when the sources are well-backed and credible. But honestly, you would be MUCH better off just reading “Why We Sleep” by Matthew Walker, Ph.D. which says just as much as this book and more with reputable references. 

I would just remind fellow nonfiction readers to be diligent with their sources and always read critically. It’s dangerous to read blindly and take it as fact just because “you read it in a book,” regardless of the title or self-proclaimed expertise of the author. A healthy amount of skepticism is crucial.