Sleep training is a method used to help infants and young children learn to fall asleep independently. It often involves establishing a consistent bedtime routine and gradually teaching the child to self-soothe, which can lead to longer and more restful sleep for both the child and the parents. There are various approaches to sleep training, including the Ferber method, which involves letting the child cry for short intervals before comforting them, and the No Tears method, which focuses on gentle techniques without letting the child cry. Parents can choose the method that best fits their family's needs and values.