Sleeper is a double album by Keith Jarrett's "European Quartet" recorded on April 16, 1979 in Tokyo, and released on ECM 33 years later in 2012.

[4] Below is the list of the dates and venues: Some of the music played in Tokyo (different dates other than April 16) is collected in the album Personal Mountains In a review for AllMusic, Christian Genzel wrote: "As a companion piece to the live albums Nude Ants and Personal Mountains..., Sleeper offers another noteworthy document of the creative interplay between these four musicians.

[5] Writing for The Guardian, John Fordham called the album "enthralling", and stated: "'Personal Mountains' is a 20-minute tour de force of shifting harmonies and chord-punching Latin grooving.

'Oasis' sounds like an Ornette Coleman lament, and 'New Dance' is probably as close as any of these performers came to playing a mainstream jazz-calypso like Sonny Rollins' famous version of 'Don't Stop the Carnival'.

In addition to the symbiotic rhythm section, Garbarek naysayers may find themselves knocked on their rears by the exuberant, life-affirming themes issuing from his bell, each fitting snugly in Jarrett's pianistic relief.