This composition investigates the psychological and atmospheric qualities of sleep through the technical capabilities of the solo flute. Richard Causton, a contemporary composer, utilizes the structural framework of George Seferis’s poem Mythistorema to inform the musical language of the piece. The work argues that sleep is not a state of rest, but an unsettling, shifting experience that can be represented through unstable time signatures and varied timbral exploration.

Experts highlight this piece as a challenging work that demands high technical proficiency from the performer to capture its intended dark atmosphere. Musicians frequently note the complexity of the shifting time signatures and the precise requirements for tonal control.