I'm reading a new sleep book that recommends a solid bedtime routine, putting him in the crib awake and saying a "goodnight I love you, see you in the morning"-like script; then leaving. You come back every 5 minutes and say the same script then leave over and over for as long as it takes. My LO is 9 months, and let's just say it's time. Has anyone tried this method (some folks call it the sleep wave)? Experiences?