When I was employed, I slept 6 hours per day.
The difference in mood is massive.
However, I'm not sure if the working world will change. It's a zero sum game of who is willing to torture themselves the most, which is sometimes correlated with how much work you produce.
At my past job, it wasn't enough to just produce. You had to /look like/ you were producing. This meant working 8-6. This meant skipping lunch. This meant always sitting at your desk (no walking meetings).
Obvioisly not every employer is like this. But working is a pretty decent way to kill yourself. It happens to most people eventually.