The name of the work refers to the hours of night when impulses buried deep in the sunconscious are released from the labyrinth of the mind. The subject ties in with Harri Vuori's composition - althoug abstactly - in that both the light, mobile motifs and the slower, lyrical passages are gradually forced to give way to a repetitive texture rising from the depths. It builds up to a mighty climax that makes heavy demands on both the technique and the physical resources of the performers. Duration ca 10 minutes.