I think it works; I have been doing it with my daughter for a month - well trying to... it is very tricky to stay with them and time perfectly the 5 minutes - very hard . But I have told my daughter things on those 5 minutes and the next day she talks and does what suggested. My husband and I were quite amaze- Key in this as always is being consistent and steady - which is our problem as my daughter can take up to 1 hour before falling sleep many times I fall sleep before her...
hard to keep up but worth it.