I used this as a supplement to my board review course and notebook. I also used the Butkow (sp?) PSG atlas from 1996-ish. This book was a great resource and covered a lot of material that I did subsequently find on the ABIM Sleep Medicine Exam. I don't know if I passed, yet, but, if I do, I'll attribute a big part of it to this book.Addendum Dec 2008: I passed the ABIM Sleep Boards. This book helped lots.