There's a commonly held belief among the devotees of attachment parenting that sleep training isn't compatible with their parenting style.
That's not surprising, since one of the founders of the attachment parenting movement, Dr. Bill Sears, amended the core principles of his system to include "Beware of baby trainers."
But having worked with parents who subscribe to this approach, I have found that there's plenty of room for compromise. You can stick to every fundamental rule of the attachment parenting model and still teach your baby the skills they need to sleep through the night.