I wrote previously about my colleague Dr. Mustafa Ozkaynak's study of fatigue among emergency-room nurses, which showed how fatigue impairs decision-making, especially at the level of the Narrative Mind. In a new paper that we published from the same dataset, Dr. Ozkaynak's team examined psychometric properties of the Swedish Occupational Fatigue Inventory (SOFI). We found that the emergency-room nurses' experience of fatigue was a good fit with what people have reported in other occupational contexts, with 4 different aspects of fatigue: (a) lack of motivation, (b) physical discomfort, (c) sleepiness, and (d) an overall "lack of energy" scale that both encompasses the other 3 elements of fatigue and also has some unique items associated only with lack of energy. We tested whether 2 additional items from another tool, which are generally understood to measure (e) mental fatigue, would be a meaningful addition to the SOFI, but in this case they were not -- either ...