Question: What subject of Andy Warhol's film "Sleep" has sat in on  Bernadette Mayer's workshopts?

<P0-S0> San Diego Surf is a 1968 feature film directed by Andy Warhol and Paul Morrissey, and filmed in La Jolla, California in May 1968. <P0-S1>  On June 3, 1968, Warhol was shot by Valerie Solanas, bringing work on the film to a halt. <P0-S2>  In 1996, the Andy Warhol Foundation commissioned Morrissey to "finish editing the film based on Warhol's notes". <SEP> <P1-S0> Empire is a 1964 American black and white silent film written, produced, and directed by Andy Warhol. <P1-S1>  It consists of eight hours and five minutes of continuous slow motion footage of the Empire State Building in New York City. <P1-S2>  Abridged showings of the film were never allowed, and supposedly the unwatchability of the film was an important part of the reason the film was created. <P1-S3>  However, a legitimate Italian VHS produced in association with the Andy Warhol Museum in 2000 contains only an extract of 60 minutes. <P1-S4>  Its use of the long take "in extremis" is an extension of Warhol's earlier work the previous year with "Sleep". <P1-S5>  Warhol employed Rob Trains to be the projectionist for a screening of the film. <P1-S6>  Trains miscalculated and mixed the order and speed of the reels for the eight-hour movie. <P1-S7>  After a positive review in "The New York Times", Warhol actually liked the "mistake" and employed Trains for the entire summer. <SEP> <P2-S0> John Giorno (born December 4, 1936) is an American poet and performance artist. <P2-S1>  He founded the not-for-profit production company Giorno Poetry Systems and organized a number of early multimedia poetry experiments and events, including "Dial-A-Poem". <P2-S2>  He became prominent as the subject of Andy Warhol's film "Sleep" (1963). <P2-S3>  He is also an AIDS activist and fundraiser, and a long-time practitioner of the Nyingma tradition of Tibetan Buddhism. <SEP> <P3-S0> Bernadette Mayer (born May 12, 1945) is an American poet, writer, and visual artist associated with both the Language poets and the New York School. <P3-S1>  Mayer's record-keeping and use of stream-of-consciousness narrative are two trademarks of her writing, though she is also known for her work with form and mythology. <P3-S2>  In addition to the influence of her textual-visual art and journal-keeping, Mayer's poetry is widely acknowledged as some of the first to speak accurately and honestly about the experience of motherhood. <P3-S3>  Mayer edited the journal "0 TO 9" with Vito Acconci, and, until 1983, United Artists books and magazines with Lewis Warsh. <P3-S4>  Mayer taught at the New School for Social Research, where she earned her degree in 1967, and, during the 1970s, she led a number of workshops at the Poetry Project at St. Mark's Church in New York. <P3-S5>  From 1980 to 1984, Mayer served as director of the Poetry Project, and her influence in the contemporary avant-garde is felt widely, with writers like Kathy Acker, Charles Bernstein, John Giorno, and Anne Waldman having sat in on her workshops. <P3-S6>  Mayer was a 2015 Guggenheim Fellowship Recipient and received a National Book Critics Circle Nomination for her most recent book, 2016's "Works and Days".