Why we're all so tired

Every person I know complains that they have too much work at the office. Most have cut down on lunch time and breaks. Some work extra hours. Others forego vacations or come in when they're sick. Many also say that positions are not being filled when co-workers leave; supervisors then transfer those duties to the already stressed employees left behind.
Yet the government now says our productivity has slowed in comparison to other quarters. Really?
I want to know: So who's playing hookey on the job?