Guys like Jack Ma consider being awake to be working. It's how a former CEO of mine justified his 10 week a year vacation schedule with 2.5 day work weeks. The man would walk into the office after a weekend at around 11:30am on a Tuesday to select a few employees to eat lunch with, and then make up for his missed work by staying until 7:30 on Thursdays.
Then he said other things that pissed off the wrong people and has not been seen since then.