Earlier quoted context omitted.
I just don't get how you can be successful doing stuff that way. People with that little sleep are not going to function optimal. They are going to make mistakes. But both Tesla and SpaceX seems very successful so I wonder if they are successful despite of this or because of this.
I think it requires strong, perfectionist, top-down leadership. See for example Steve Jobs or James Cameron. They aren't the most popular bosses, but they create amazing things by working their people hard and watching everything very closely.
I think it's a trade off. I don't think not getting enough sleep is healthy. Without health--what's the point?
I also heard Steve Jobs used to frequently work until 12:00 a.m., and sometimes call his employees at 3 a.m. in the morning.