Eighty percent of medical error are attributed to human factors. Human factors experts suggest the least explored factor in patient errors is attention, specifically, situation awareness. The purpose of this article was to analyze the concept of situation awareness using a hybrid concept analysis. The experience of situation awareness among nurses was elicited during the fieldwork phase through semistructured interviews. Content and relational analyses yielded 9 themes: perception, comprehension, projection, knowledge and expertise, cognitive overload, interruption management, task management, instantaneous learning, and cognitive stacking. A conceptual definition of situation awareness emerged along with recommendations for application in nursing.