Mind wandering is a cause of unhappiness. Because most of the time, mind wandering is about worries and concerns.
He designed a mobile app – Track your happiness – inviting people to tell how they feel during the day.
Matt Killingsworth work has shown that focusing on present activities help us feel happy. This is why sometimes you see that manual jobs can be described as more fulfilling as intellectual ones.
This is why you should feel more yolo.