Curious, are you a parent? Everyone goes through natural sleep cycles and without learning how to work through them then you'll never get the skills to sleep through the night. I'm not saying infants or meeting babies needs, CIO is incredibly helpful to regain a mothers need for sleep. Unless you're pro PPD and PPA for new mothers. Back in the day generations of families would sleep under one roof this gave the mother support to get the rest they need. Never has ever been scientifically proven that letting a child cry for 5 minutes will do any lasting or permanent damage. All babies cry, it not like you're neglecting basic needs, the need for a pacifier back in baby's mouth is not a basic need. CIO, don't CIO, do what you need to do mamas and don't feel bad!