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Emotional granularity describes the ability to create emotional experiences that are precise and context‐specific. Despite growing evidence of a link between emotional granularity and mental health, the physiological correlates of granularity have been under‐investigated. This study explored the relationship between granularity and cardiorespiratory physiological activity in everyday life, with particular reference to the role of respiratory sinus arrhythmia (RSA), an estimate of vagal influence on the heart often associated with positive mental and physical health outcomes. Participants completed a physiologically triggered experience‐sampling protocol including ambulatory recording of electrocardiogram, impedance cardiogram, movement, and posture. At each prompt, participants generated emotion labels to describe their current experience. In an end‐of‐day survey, participants elaborated on each prompt by …