"I’ve spent the past 26 years of my life on a trading floor, and the action this week ranks right up there with the best of them."

That is how Tony Pasquariello, head of global hedge fund coverage at Goldman Sachs, described this week's chaos - and it matche dthe sentiment we heard from many other trading desks with the 'f' word most often cited: fatigue!

Don’t take Pasquariello's word for it, consider these intraday ranges for S&P: