This research project investigates the way in which Paul Hindemith expresses musical and extramusical ideas during his early compositional period through an analysis of the fourteen movements of his work for solo piano, In einer Nacht... Träume und Erlebnisse, op. 15 (In One Night… Dreams and Experiences). Op. 15 is a set of character movements composed in 1917-1919 and unified into a cohesive, singular work through extramusical connections and a common harmonic language. Hindemith depicted the night as a mystery unfolding in a series of descriptive and untitled miniatures displaying a thrilling journey into the unknown. The set reflects Hindemith’s unique chromatic compositional language in the late 1910s, and his interests in Expressionism, early forms, and popular elements such as jazz. However, due to its delayed publication, op. 15 remains an underestimated work and deserves closer attention.This paper describes the work’s creation, problems it faced in its reception and dissemination, and offers a brief literature review related to the set. The second chapter places op. 15 in the context of Hindemith’s early development as a composer (up to 1920) and his hallmark compositional styles. The most substantial portion of the research is an analytical description of the fourteen movements. Each chapter offers an overview of a movement’s general character followed by detailed depictions of musical or extramusical elements. It is hoped that this text will ultimately aid performers in creating a more accurate and musically cohesive performance. In a brief conclusion, the common elements between movements are reemphasized, again drawing the performer’s attention to each movement as a part of the longer narrative. Scholarship on this set provides opportunities for a better understanding of Hindemith’s early music.