Ah, Mac, I feel for ya. My teaching career was like that - I mean, I got sleep, but I felt like a tiger was chasing me the whole time. Being awake for days is not good for the nervous system at all! I've recently watched the TV series Industry which gives a sense of the high adrenalin, high pressure anxieties of people in finance/trading - early on in the series gives a real sense of those who first get into it and the pressures they are under. I definitely wouldn't have the mental strength to cope with that at all!