And (surprise, surprise) for us employees low on the totem pole, we're more prone to depression. The people higher up the food chain aren't as bad, the survey suggests. That's because they have more control over the work they do and their schedules.

In the health care industry, we talk a lot about workplace wellness programs—employers everywhere are rolling out programs to make employees healthier, making them eat right and exercise so they lose weight and in turn cost the company less in health care expenses.

And though for the most part employees become more productive at work because of wellness offerings, the happiness factor isn't, well, factoring in. In general, it makes our home lives worse off too, makes us lose sleep at night and resent our office lives. Researchers say these long hours at the office could contribute to depression in several ways—by creating family or relationship conflicts, for instance, or by elevating levels of the stress hormone cortisol.

Maybe armed with this information, employers should also focus on employees' mental health, and maybe not work them so hard—because doses of Prozac or therapy sessions are sure to rack up more medical bills, too.

Sure, I've done my part in wellness today (eating an apple), so I'm thinking my employer should do theirs, too. I've put in a solid five hours of work so far today—I think I should cite depression risk and clock out.