The Happy Sleeper literally changed our life - words cannot tell how grateful we are for the book and our consultation with the authors. Everyone in the family was miserable and I could tell my son was suffering from lack of sleep. As the book says, it's not a magic bullet or a one time thing - if it's the right method for you then it becomes your family's philosophy on sleep.
For us, it was absolutely the right approach. Minimal crying and we now have the confidence to help our son get the sleep he needs to develop. 2 months after we implemented the sleep wave, we made an international move. Our baby did so well adjusting to lots of different homes as we visited family, adjusting to the time difference, adjusting to our new home, and an early arrival of the 8 month sleep regression. He's sleeping great at night and we easily adjusted from 3 to 2 naps recently. Like all sleep approaches, you must be consistent, but this book has all the tools.