The study investigates the idea that feeling good and functioning well-being are regulated by two different mechanisms: hedonic and eudaimonic. At the state level it is assumed that happiness is a hedonic feeling typically experienced when life is easy or a goal is reached. Inspiration is a eudaimonic feeling typically experienced when facing challenges in the process of goal attainment. At the trait level we assume that personal growth is connected with eudaimonic rather than hedonic mechanisms. These assumptions were confirmed with data from 465 employees of the Occupational Health Services in Norway using day reconstruction method. Multilevel analyses showed that complex work situations increased inspiration and decreased happiness. Personal growth had a stronger effect on inspiration than on happiness. Our results support the idea that pleasant feelings (hedonia) and optimal functioning (eudaimonia) have different roles to play in the regulation of behavior and therefore need to be distinguished from one another.