My DS was an awful sleeper and this is the only book that ever made any sense to me. He essentially tells you what is happening neurologically at certain stages so you have a better idea what is reasonable to expect and what options you have. I like that he doesn't say you have to do this or that, he just gives you choices. I read his new book, Your Fussy Baby, before DD was born (fearing the worst!) and then of course, she has slept like a dream. Anyway, I know babies and sleep is a controversial subject, but what Weissbluth has to say has helped me as a mom of both a terrible sleeper and a great sleeper. He just help me know my babies better. Hope this helps!