The study in the New England Journal of Medicine comes as the Accreditation Council for Graduate Medical Education is reassessing requirements that prevent residents from working extremely long stretches or back-to-back shifts, reports NPR.

“Research on the deleterious effects of chronic sleep deprivation is just overwhelming,” said Dr. Deborah Hall, president of the medical student association. “I’m concerned we’re going to walk away from a lot of progress that’s been made without overwhelming data [showing] that residents aren’t subject to the ordinary limits of human neurobiology.”