Sleep has many faces: The interplay of sleep and work in predicting employees' energetic state over the course of the day.

Sleep affects employees' functioning. In this study, we differentiate biological (chronotype), quantitative (daily sleep duration), and qualitative (daily sleep quality) sleep characteristics and examine their relationship with the trajectory of employees' vigor over the course of the day. Building on the two-process model of sleep regulation and the job demands-resources model, we examine whether sleep characteristics are differentially related to the trajectory of vigor as an energetic state.