Does the term "sleep training" conjure up images of wailing babies and agonized parents? If so, then I hope what I'm about to say next will help paint a different picture for you: sleep training does not have to involve hours of crying. Sleep training does not have to mean you listening to your baby wail because you're not "allowed" to offer any comfort. Simply put, sleep training does not mean letting your baby cry it out. So what does sleep training mean? Sleep training is merely the