Al Cisneros - vocals & bass
Matt Pike -guitar
Justin Marler -guitar
Chris Hakius drums
Matt Pike went on to form the Stoner Doom band High on Fire.
Al Cisneros and Chris Hakius went on to form the Stoner Doom band Om.
The song "Dopesmoker" (highly shortened obviously) was included in the official soundtrack of the movie Broken Flowers, directed by Jim Jarmusch and starring stars like Bill Murray and Sharon Stone.
Sleep songs "Dragonaut" as well as "Some Grass" were featured in the movie Gummo.