Meditation is an interesting method for increasing one’s sense of happiness because not only has it stood the test of time, but it’s also been tested quite extensively in the lab. Part of the effect of mindfulness meditation is to quiet the mind by acknowledging non-judgmentally and then relinquishing (rather than obsessing about) unhappy or stress-inducing thoughts....
These findings may suggest that for people who practice meditation or prayer, the focus becomes less on the self as a distinct entity from the external world, and more on connection between the two. This reflects the idea discussed earlier where shifting attention from inside to outside is at least part of what quells unhappiness.
--"Eat, Smoke, Meditate," on Forbes.com (9/21/2011)