“Enter Sandman” is a song by the American heavy metal band Metallica, released in 1991 as part of their self-titled album, often referred to as “The Black Album.” The song features a heavy guitar riff and explores themes of childhood fears and nightmares, using the metaphor of the Sandman, a mythical figure who brings sleep. The track became one of Metallica's most popular songs, receiving significant radio play and contributing to the band's mainstream success. Its haunting lyrics and powerful instrumentation have made it a staple in rock music, often performed at concerts and featured in various media.