Les Espaces du sommeil

Les Espaces du sommeil is a musical composition by Polish composer Witold Lutosławski for baritone and orchestra, which takes its name from the poem it sets by French Surrealist Robert Desnos. It is in one movement, with a three-section scheme lacking clearly marked caesuras. Lutosławski said it was "neither a song nor a set of songs, but a symphonic poem with a baritone solo."

Composed in 1975, it was first performed on 12 April 1978 in Berlin by the baritone Dietrich Fischer-Dieskau and the Berlin Philharmonic Orchestra under the direction of the composer. The piece is Lutosławski's first composition set to the poetry of Robert Desnos, to which the composer returned in 1990's Chantefleurs et Chantefables.