Cry it out sleep training, also known as the extinction method, is a popular technique used by parents to help their babies sleep through the night. The method involves letting the baby cry for a set amount of time before going in to comfort them. The idea behind it is to teach the baby to self-soothe and learn how to fall asleep on their own. While this method may not work for every family or baby, many parents have found success with cry it out sleep training. It is important to note that this method should be used with caution and should only be implemented after consulting with a pediatrician.