In today's article, The Baby Sleep Site® founder and expert sleep coach Nicole Johnson answer this common question: Is there a difference between sleep training and cry it out? ~~~ I thought I should first talk about my philosophy on helping your child learn healthy sleep habits. Sleep Training I don't define "sleep training " as cry-it-out (CIO). You don't have to let your child cry to teach healthy sleep habits. Some people seem to think they are synonymous and I disagree.