Many unhappy returns for wandering minds

A wandering mind often stumbles downhill emotionally. People spend nearly half their waking lives thinking about stuff other than what they’re actually doing, and these imaginary rambles frequently feel bad, according to a new study that surveyed volunteers at random times via their iPhones.

People’s minds wander at least 30 percent of the time during all activities except sex, say graduate student Matthew Killingsworth and psychologist Daniel Gilbert, both of Harvard University.