Harvard researcher Matt Killingsworth created an app in attempts to answer the question “what makes us happy?” once and for all, and the results have been an eye-opener.
According to Mr. Killingworth’s data, we’re happiest when we are mindful of the moment, and we’re least happy when the mind is wandering. More details can be found in the article "Dear TED: "How can I be happier at work" .
Another very insightful article "Using Mindfulness to Create Real Happiness at Work" from an esteemed mindfulness researcher Sharon Salzberg can also let you know more about it.