Of course, if you reread my comment I mentioned other random jobs may also do that.

I have seen people say sleep deprivation from mental health can also be exhausting af . The difference with a self issue is a doctor can often prescribe a sleeping pill so you can get rest. But a parent can't choose that if they don't have a person they can rely on for child care in the night.

For another example my wife has a disability, she works 2-3 hours and drives home, so mentally and physically tired that she pulls over about halfway home and sleeps at the side of the road for half hour, before continuing the journey. She is that exhausted.

Now imagine somebody else controls when she could take that needed sleep time.