The Times reports on the undiscussed costs of stress on the job: Sixty-two percent say their workload has increased over the last six months; 53 percent say work leaves them 'overtired and overwhelmed.' Even at home, in the soccer bleachers or at the Labor Day picnic, workers are never really off the clock, bound to BlackBerries, cellphones and laptops. Add iffy job security, rising health care costs, ailing pension plans and the fear that a financial setback could put mortgage payments out of reach, and the office has become, for many, an echo chamber of angst. It is enough to make workers sick - and it does. Decades of research have linked stress to everything from heart attacks and stroke to diabetes and a weakened immune system. Now, however, researchers are connecting the dots, finding that the growing stress and uncertainty of the office have a measurable impact on workers' health and, by extension, on companies' bottom lines.