It absolutely is. Let me throw this out there, though:
It's common practice -- and supported by the United States Government -- for medical students and residents to work 30 hours (realistically, up more since that's just WORK time) at a stretch. This is to support our lovely public health system. (If you doubt this, consider the fact that most academic institutions are predominately uninsured and Medicaid.)
There have been numerous studies that show that the impairment from this level of sleep deprivation is at least, if not worse, than 0.08 BAC. One showed 0.1 BAC equivalent.
Should we require a mental aptitude and coordination test before allowing someone to drive?
Either way, the government should pull its head out of its ass and regulate that. I worked with a doctor who twenty years ago left a 36 hour shift, went to pick up her kids, and veered off the road, killing her kids and seriously injuring herself.
And before someone says that it's these peoples' choice to work that long, here's a clue: It isn't. It's mandatory from the academic institutions, and encouraged by the government by virtue of regulatory agencies.