Some things about the book annoyed me. For instance, the author seemed overly prone to relating the book to his own personal experiences with sleep paralysis, which annoyed me when I didn't share those experiences. A third of the book is devoted to seeing, like, spirits or evil beings when you're in sleep paralysis, even though only 20% of people who experience SP see that, so I thought that was weird. I also think he spent excessive time talking about the myths and legends surrounding the phenomenon. On the other hand, it was the most in-depth piece of writing I have found on sleep paralysis, which I appreciate. So I guess I would sum it up by saying that while I didn't particularly like the book, I don't regret reading it, either.