I read about it in Pantley's book, "No Cry Sleep Solution". It's somehow specially made to retain a mothers/fathers scent and it supposed to work wonders in helping your baby sleep on their own. It sounds like a tall order for a doll/blanket, but there are a lot of great testimonials. I am considering getting one for LO, he will sleep on our bed (I assume because it smells like me?), but not his bed. This might help??