Research on emotion is fraught with methodological limitations, as feelings can have non-discrete, ephemeral, and ineffable qualities. Audio diaries offer a method for capturing the sequential and varied experience of emotions as they emerge from everyday life. Following theory and methodological development in the sociology of emotion, we examine how audio diaries might be used to capture (a) candid emotions that emerge spontaneously and may reflect unpopular or negative social views and experiences, (b) the self as unfinished, and (c) processes of emotional reflexivity that exist alongside the diverse emotions that infuse everyday life. We explore how waveform visualization of audio recordings might be meaningfully combined with qualitative analysis of transcribed data to illustrate emotional contours in situ. We draw on audio diaries collected from 48 nurses from two US hospital systems to explore the possibilities and limitations of using audio diaries in emotion research.