> Usually. Except if the 4 hours of sleep leads you to crash your car, or run into a pedestrian, or forget your child in a car.

> In the usual case, a day of missed sleep is normally OK, but when you are responsible for other people (rather than just code quality/productivity), why risk it? And even in the general case...why risk it? It is far better to lead a normal lifestyle and be at peak performance in all parts of your responsibility.

I'm sure most people with responsibilities getting less than their required sleep are not doing it by choice. When I have had to forgo sleep it was out of necessity (primarily to work a second job). Of course it is far better to get the optimal sleep your body needs. It's not about people intentionally engaging in risky behavior needlessly—oftentimes people are trading sleep for putting food on the table, for instance.