This paper presents a novel approach to formalizing "style," the way authors construct personal narratives to give meaning to their experiences. It analyzes style through patterns of linguistic choice, leveraging a framework that integrates functional linguistics, computer science, and psychology. Using a language model, we automatically extract linguistic features and, specifically, analyze dream narratives to demonstrate the relationship between linguistic choice and psychological state. Using a case study of a war veteran, we reveal that verb types (verbal process versus mental process) are related to psychological state.