Sleepless is a song by the band King Crimson, released as a single in 1984. It is best known for its distinctive opening bassline which features Tony Levin slapping on the strings to create its pulsating beat. It came from Levin's habit of tapping the strings in rehearsal and as well as at soundchecks. The 2001 re-release features several different versions of the song.
The opening bassline has been used as the show theme for Australia's RAGE program, since 1987.