Sleeper are an English rock band formed in London in 1992. The group had eight UK top 40 hit singles and three UK top 10 albums during the 1990s. Their music was also featured in the soundtrack of the pop cultural hit movie Trainspotting. The band split up in 1998, but reunited in 2017.

Jon Stewart met Louise Wener at Manchester University in 1987 in a political philosophy class. They played in a number of bands at university, including jazz outfit the Lime Street Blues Band, then after graduating in 1988, moved to London to seek gigs. Wener later wrote that "we sounded not unlike the Sundays, but as time went on our music became increasingly influenced by US bands such as Hole, Nirvana and, most especially, the Pixies". They advertised for new band members in Melody Maker ("Bass player and drummer wanted. Influences The Pixies and The Partridge Family") and recruited Diid Osman and Andy Maclure. Wener solicited interest from record label representatives by sending out a fake NME review, a move she called "pure cheek and cut-and-paste fakery."

At one point, the band called themselves Surrender Dorothy, after the smoke trail in the sky from the Wizard of Oz movie, but abandoned this idea after discovering that several other bands had done the same thing. They subsequently chose the name "Sleeper" after the Woody Allen film Sleeper, and also because the word has a number of different meanings (a spy, an unexpected hit, etc.). In 1993 Sleeper signed to Indolent Records, a subsidiary of RCA Records, and released three EPs and singles before their breakthrough single release, "Inbetweener", which notably featured UK TV personality Dale Winton in the promo video. Prior to the release of "Inbetweener" Sleeper had been the opening act for Blur on that band's tour to promote the Parklife album, and became closely associated with Britpop as a result.

The band's debut album release Smart was certified gold by the BPI for sales of over 100,000 copies. It was followed by the platinum-selling (over 300,000 copies) release The It Girl which yielded four top 20 hit singles "What Do I Do Now?", "Nice Guy Eddie", "Sale of the Century" and "Statuesque". Sleeper recorded a cover of the Blondie song "Atomic", which was used in the film Trainspotting, after Blondie refused to allow the use of the original version. "Statuesque" also features in the movie and its follow-up soundtrack volume. The band’s third album, Pleased to Meet You, released October 1997, was a UK Top 10 hit and certified silver, though had fewer sales than the previous albums; the band split in March 1998 after a tour in which venues had been cancelled or downsized due to lower than expected ticket sales.

After Sleeper split, Wener and Maclure recorded material for a new project, aimed at a more mainstream market and featuring a guest appearance by George Michael. However, the project was not completed at the time, and Wener went on to have a career as a novelist. Her fourth book for Hodder & Stoughton was published in 2008. Wener also features prominently as an interviewee in John Dower's feature film documentary on Britpop, Live Forever (2003).

Stewart moved to Los Angeles, California, where he played with West Coast band UFO Bro and contributed as a session guitarist to k.d. lang's album Invincible Summer (2000) and Melanie C's album Reason. After returning to the UK he became Course Leader of the BA (Hons) Music Business and a lecturer in popular culture and music history at the British and Irish Modern Music Institute in Brighton, where his former students include The Kooks, James Bay, Black Honey, The Xcerts, Kate Walsh and Luke Sital-Singh, as well as members of As It Is and Miss Vincent, amongst others. Stewart also wrote a monthly column for Guitarist magazine from 2002 to 2010, and gained a PhD in Music from the University of Southampton in 2018. In 2019 he joined The Wedding Present as guitarist during their thirtieth anniversary Bizarro UK and EU tour.

Osman subsequently went on to become a session player with Parlophone records band Dubstar and later became an artist manager, with bands including Infectious Music outfit My Vitriol, Hell Is For Heroes on EMI and Atlantic Records band The Glitterati, and helped writer-producer Justin Parker sign to Sony Music publishing. Maclure later ran a "Punk Rock Karaoke" enterprise with DJ Steve Lamacq.

A greatest hits compilation, with a tracklisting selected by and artwork designed by the band themselves, was released on Sony/BMG in 2007. Their first two albums were reissued as deluxe versions on 29 November 2010, with second discs of B-sides and live tracks.