New research from America’s Harvard University shows people spend nearly half of their waking [?] daydreaming, and not thinking about what they are doing. Moreover, they say this mind wandering is a of unhappiness. The study, to be published in the journal ‘Science,’ surveyed the thoughts and [?] of over 2,200 volunteers. The participants downloaded an iPhone app and sent more than 250,000 messages the day and night. Researchers Matthew Killingsworth and Daniel Gilbert conclude that most of us are in world for more than 46 per cent of our [?] hours, and that means we are unhappy: "A human mind is a wandering mind, and a wandering mind is an mind,” they said.