A lullaby is a peaceful melody that has been calming infants for epochs. These tunes are often simple in structure, with familiar melodies and copyright that describe dreams.
A good lullaby can induce slumber quickly, https://youtube.com/playlist?list=PL9MA18nixW__bOMUT9dxRavfZM82qEeYy&si=TUbK6WSPIpr-1n66