Abstract
This paper experimentally studies the relationship between happiness, attention and time perception. The experimental results challenge the prevailing results in the economic and psychological literature. A Go/No-Go test reveals a clear negative correlation between happiness and attention: the subject who is happier is also more inattentive, probably because of his or her state of lightheartedness, a state of mind that seems to negatively affect performance. Furthermore, the fact that happier subjects evaluate the passage of time with different objective and subjective measures opens up paths of further research in assessing a new feature of happiness.