Sleep is an American stoner/doom metal band from San Jose, California. Guitarist Matt Pike and bassist and vocalist Al Cisneros have been the only constant members throughout the band's history. Critic Eduardo Rivadavia describes them as "perhaps the ultimate stoner rock band" and notes they exerted a strong influence on metal in the 1990s.

Stoner rock, also known as stoner metal or stoner doom, is a rock music fusion genre that combines elements of doom metal with psychedelic rock and acid rock. The genre emerged during the early 1990s and was pioneered foremost by Kyuss and Sleep.