"In our assessment of 35,000 leaders and interviews with 250 more, we found that the more senior a person’s role is, the more sleep they get.
...
It used to be a badge of honor to brag about sleeping few hours, but our research should serve as inspiration for aspiring leaders to make sleep sacrosanct. The key message: If you want to be an effective leader, and rise in the ranks, get enough sleep."
I think this makes sense. Money makes it way easier to automate / hire for non-essential things. My time is basically just work, family, reading or sleep at this point. Everything else is automated or hired for.