I can't imagine a CEO or even a regular white-collar worker going to bed at 9pm. Most regular employees are encouraged to stay late, often until 7 or 8pm, meaning they have to stay up until 11pm or later to have any sense of "free time" to relax and unwind, not to mention family time. For CEOs, they are never really off the clock so to speak, and depending on the culture at their company they will often work until midnight, then they are back up at 6am or earlier to do it all again.

I'm actually glad that I went back to government work; set schedules with very little need for overtime or staying late, and taking a vacation is pushed to the point of nearly being mandatory. I have more free time and family time, and that's important for mental health.