When your brain's emotional equipment needs a tune-up, you get clues: you do not sleep well, you worry too much, you start feeling overwhelmed, you lose your enthusiasm or your ability to concentrate.
If you are often feeling depressed, anxious or stressed, you are not alone. We are in a bad-mood epidemic, a hundred times more likely to have significant mood problems than people born a hundred years ago. And these problems are on the rise. Adult rates of depression and...