Sleep is a 1964 American underground film by Andy Warhol. Lasting five hours and 21 minutes, it consists of looped footage of John Giorno, Warhol's lover at the time, sleeping.

The film was one of Warhol's first experiments with filmmaking, and was created as an "anti-film". Warhol would later extend this technique to his eight-hour-long film Empire (1965).