Sleep Instantly Within 3 Minutes with Rock-a-bye Baby Lullaby ( Instrumental)br br Lullabies calm and relax crying babies. They help the child express their emotions in a better way instead of anger. When babies have improved sleep, they stay happy, active, and more engaged in activities. br br Not only for babies, Lullabies are great way of sleeping a child. They provide peace and calm environment and helps to sleep better.