Enter Sandman was released as the first single from their eponymous fifth album, Metallica. The music was written by Kirk Hammett, James Hetfield and Lars Ulrich. Vocalist and rhythm guitarist Hetfield wrote the lyrics, which deal with the concept of a child's nightmares. The single was also released in limited box (Vertigo - METCD 7), that included "Enter Sandman" single and space for other 3 singles from Metallica