In 2009, Harvard psychologist Daniel Gilbert and Matthew Killingsworth, a psychology doctoral student at Harvard launched trackyourhappiness.org, a website designed to gauge the mental state and activities of volunteers several times a day. The researchers used iPhones to text volunteers and encourage them to visit an online survey in order to report what they were doing, and describe how happy they were feeling. Subjects were also asked to record whether they were thinking of their activity, or something else. After analyzing the experience of 2250 adults, Gilbert and Killingsworth found that 47% of the time, people werent thinking about what they were doing, and that volunteers were less happy when their thoughts were elsewhere. The statistics indicated that mind wandering earlier in the day correlated to a poorer mood later, signifying that daydreaming caused discontent.