Do tired and overworked doctors on marathon shifts make more mistakes? It's a nightmare that many people don't think about: How your doctor's schedule may be harming your health. Sleepless shifts of up to 30 hours are routine for many of Canada's 12,000 resident doctors. And that's unacceptable and dangerous, according to a panel of medical experts. But Canada has no national standard for the hours residents work. David Common and two doctors stay awake and put themselves to the test in a 26-hour sleep lab experiment, to test how sleep deprivation can affect even the best doctors.