Sleep training, or teaching your baby healthy sleep habits, can be confusing and frustrating. One of the most popular sleep training methods is The Ferber Method, also known as Ferberizing or graduated extinction. This method involves letting your baby cry at increasingly longer intervals until they are sleeping through the night and taking longer naps. Here's everything you need to know about this sleep training method. What is The Ferber Method? The Ferber Method was developed by Dr.