1. After an overlooked debut, Sleep (formed in 1990 San Jose, California) released a well-received follow-up, Sleep's Holy Mountain, in 1992 on Earache. The record had obvious Black Sabbath influences, and has been described as 'the best Black Sabbath never wrote.'

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The success of Sleep's Holy Mountain landed Sleep a contract with a larger record company (London), who paid up front for Sleep's next record. As the story goes, Sleep went out and spent all the money on Orange amplifiers and marijuana (which was confirmed by Matt Pike in the documentary "Such Hawks Such Hounds" but denied by Al Cisneros in an interview with the Wire in his new outfit, OM), then went on to record what is easily one of both stoner rock and doom metal's defining moments; the 1 hour long Dopesmoker.

London refused to publish the record, and Sleep privately released a somewhat shortened version of the song (as a bootleg) in 1998 as Jerusalem before splitting up. Jerusalem was properly released in 1999, however it took until 2003 for Dopesmoker to be released in all its glory on teepee records.

Sleep's guitarist, Matt Pike, went on to form High On Fire.

Al Cisneros returned to public music in 2003 with former band mate Chris Hakius as Om, a bass and drum duo. The band's first three albums feature Cisneros on vocals and bass and Hakius on drums. On January 31, 2008 Hakius left OM and was replaced by drummer Emil Amos. OM have since completed a new full length studio album, recorded by Steve Albini, scheduled for release September 8th 2009 on Drag City.

Cisneros is also a member of Shrinebuilder (Wino, Scott Kelly, Al Cisneros, Dale Crover). Shrinebuilder's debut album was released in autumn 2009 on Neurot Recordings.

In May 2009, Sleep reformed to perform two exclusive reunion sets in England as part of the All Tomorrow's Parties music festival.

On November 19, 2009 Al Cisneros confirmed in an interview with The Obelisk that Sleep will be reuniting in the fall of 2010 for some US dates. It has also been confirmed that Jason Roeder (of experimental metal band Neurosis) will replace Chris Hakius on drums.

The group are confirmed to play the ATP New York 2010 music festival in Monticello, New York this September where they will perform Holy Mountain in its entirety.

2. Sleep Is an Hardcore Punk band from Brighton, UK. They were only active from 89-91.

3. Sleep is the name of an Australian electronic music producer. Main body of works center around long ambient "sleep"-style productions, but also has done some more techno influenced tracks (see: Stalker Remixes). Released via the Polybonk netlabel.

4. Sleep is a hip hop artist and member of The Chicharones along with Josh Martinez. As a solo artist he has released Riot by Candlelight, Christopher, and Hesitation Wounds. As a member of The Chicharones he has released When Pigs Fly, Boss Hogs EP, and Swine Country.

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