Is cognitive fatigue really that big of a deal?
I will let the research speak for itself.
And these papers are just the tip of the iceberg. There is a massive body of scientific literature highlighting the negative impact of cognitive fatigue on performance - and thus by default safety.
Dr. Olav Krigolson is the Associate Director for the Centre for Biomedical Research, an Associate Professor in Neuroscience, and the Principle Investigator of the Theoretical and Applied Neuroscience Laboratory at the University of Victoria.