Do tired and overworked doctors working marathon hours make more mistakes? Sleepless shifts of up to 30 hours are routine for many of Canada’s 12,000 resident doctors. 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.