I'm intrigued by the subject due to life long sleep issues. Mostly caused by bad habits. I enjoyed about 50% of the book and overall I appreciated that it got me some food for thought and back to working on my sleep quality. But other than that I had to say the book is really thin on material relative to its size. And the way the guy delved into subtopics like drugs and lucid dreaming left me quite skeptical about how deep he is into the field at all. That book could have been written by a student of medicine. There was nothing conveying any deeper understanding, interest or insight into sleep - no intuition.