Being "superhuman" doesn't make you terribly more likely to succeed.
He'll be long gone before Uber fails. They're probably going to dump all of the liability onto the public markets, he'll probably resign to focus on other projects or some such, and leave some MBA schmuck to deal with the mess.
Is it a characteristic of most successful founders that they can make good decisions in high stress situations while sleep deprived?
Sure, but they're killing a lot more people than the docs getting sleep.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1705824/
"Interns working five or more extended-duration shifts per month reported more attentional failures during lectures, rounds, and clinical activities, including surgery and reported 300% more fatigue-related preventable adverse events resulting in a fatality."
In the average case.
People who build billion-dollar businesses are not the average case.
That isn't to say everyone should grind super hard. People should, however, have the self-awareness to recognize whether or not they are capable of high levels of achievement. Few people are.