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

Dr Killingsworth said “mind-wandering” was “ubiquitous all activities” in our daily lives. His study found that we are happiest when exercising, with friends or making love and happy when working or using our computer at . He added: "Mind-wandering is an excellent predictor of people's happiness,” and that “our lives are [filled], to a remarkable , by the non-”. Professor Gilbert believes daydreaming is one of the that make us human. He said: “Unlike other animals, beings spend a lot of time thinking about what is not going on around them, contemplating that happened in the past, might happen in the future or will never happen at all.”