“The meaning of “Lullaby” has been speculated by fans, including as a metonymy for addiction, depression, or sexual assault,[2] and Smith has offered multiple explanations as to its theme or content, such as childhood nightmares or abuse.[2] One explanation by Smith follows that the song is about the disturbing songs his father sung to him as a kid, and the horrible ending they would always have.[3] Tim Pope, a long-time collaborator of the Cure on many of its music videos, interprets “Lullaby” as an allegory for lead singer Robert Smith’s drug-addled past.[4]” wikipedia