I am a researcher, meditation teacher and one of Amazon's top reviewers. Lee Harris was on my radar and his book was free so I decided to check it out — it's exactly what I expected: more misleading channeled information.
The first chapter I read was on sex and what I got was that typical empty but eloquent prose: ‘Open up to your sexuality and let it heal you.’ ‘Sex is your sacred friend.’ ‘Your past traumas are being released as you read these words.’ It sounds reassuring but it lacks specifics. It's style over substance.
Then I took a look at what he had to say about sleep and it was more of the same: ‘the fact that most people spend one third of their lives blind is totally okay. You are not missing anything, etc.’ Sleep should be made conscious and that's what astral projection is but this book does not want you to know anything about the astral world. Actually, the word ‘astral’ does not appear even once.
No offence to Lee Harris, because he is not the source of this material, but this book is just trying to comfort you in your ignorance and validate your current way of life. It doesn't solve any real problems. Instead it wants to console you while nudging you in the wrong direction.
If you like this book but are wanting something a little deeper, try the Teaching of the Heart series by Zinovia Dushkova. If you want a light but practical esoteric philosophy, Omraam Mikhael Aivanhov or his teacher Beinsa Duno can be quite valuable. And if you like mediums, Anthony William is great. I should point out that none of these authors will teach you how to become spiritual but at least they provide ideas you can use. If you want to grow spiritually, The Ancient Path of the Sun by Mark Atwood is where I would start.