Beware of the false dichotomy "ST or poor sleep", too
Oh no, I definitely agree that many methods can work and NCSS is one of them. (We tried it. Didn't work, though our issues weren't really covered in the book.) Cosleeping works for some, though anecdotally I know a lot of cosleepers and very few who seem totally happy with the situation. (I coslept with my babies when they were infants, FWIW--we didn't ST till about age 1.)
IOW, evidence that poor sleeping is harmful is not evidence for ST being a good idea.
Well, I think the evidence for poor sleep being harmful is much stronger than the evidence that STing is harmful. So if other methods have been tried and failed, and the family is being seriously impacted, then in those cases it does follow, IMO, that STing becomes a good idea.
I'm talking about really poor sleep, though, not just run of the mill occasional problems.
