This thesis examines a relatively new construct in organisational behaviour, thriving at work. Thriving is defined as a psychological state composed of the joint experience of learning and vitality, the dual nature of which emphasises sustainability in incorporating both physical and cognitive aspects. I present three linked empirical studies that examine thriving at work and at home, over time and across outcomes. First, based on interviews with employees, I inductively build theory regarding the existence of thriving, how the experience of thriving is used as a self-regulatory cue, how thriving across the work and home domains might be related, and describe individual outcomes of thriving. In the second study, I explore the use of thriving as a self-regulatory gauge by examining the conditions under which thriving at work is related to voluntary turnover. Analysing the data with multilevel regression, I find that thriving employees turn over (over a six-month period) unless there is a context which affords knowledge implementation opportunities. In the third study, a diary study across three days with lagged outcomes analysed with growth mixture modelling, I further examine thriving as a dynamic process that may determine self-regulatory outcomes. I find that individual levels of thriving vary within days and that increased thriving predicts improved individual outcomes at work and at home (work effort, burnout, and thriving at home). In summary, across the three studies, I find that thriving is associated with both positive and negative emotions, which suggests that there is an optimal level of thriving for an individual. I find evidence for the existence of thriving in the home domain, and that thriving at work predicts increased thriving at home. Finally, I find evidence supporting the relationship between thriving and improved individual and organisational outcomes (voluntary turnover, work effort, burnout, and thriving at home). These theoretical contributions are used to provide practical implications and outline possible future research directions.