A sleeper cell is a dormant unit in a clandestine cell system. Sleeper Cell(s) also may refer to: Sleeper Cell (TV series), a 2005 Showtime series "Sleeper Cells", a 2009 episode of the TV series Monsters Inside Me "Sleeper Cell", a song on the 2008 collaborative hip hop album Pain Language "Sleeper Cell", a song by the American industrial band Caustic See also Sleeper agent, a spy who is placed in a target country or organization to act as a potential asset if activated Detroit Sleeper Cell, a group of men who the United States Department of Justice believed were plotting an attack on Disneyland