Complete storyBBC Nov. 12, 2010People spend nearly half of their waking hours not thinking about what they are actually doing, according to a US study conducted via the iPhone.More than 2,200 volunteers downloaded an app which then surveyed them about their thoughts and mood at random times of day and night.
"This study shows that our mental lives are pervaded, to a remarkable degree, by the non-present."
Reports of happiness were most likely among those exercising, having a conversation or making love, whereas unhappiness was reported most while people were resting, working, or using computers.
Dr Killingsworth said: "Mind-wandering is an excellent predictor of people's happiness."
However, whether mind-wandering is the cause, or the result of unhappiness is still not proven by the research.