The industrial revolution fucked up a lot about long standing human practices, and our health suffers for it.

My wife will work maybe half the year, then take off for a few months. During that time she settles into a natural sleep/wake cycle of about 8 hours awake, 4 hours asleep, 6 hours awake, 6 hours asleep. That seems to mirror what has been explained from the time prior to industrialiation.

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I used to work with a venture capitalist that put in crazy hours. He was selling his soul to reach a goal, and had insane energy. Up to run/train for marathons at 4am, work from 6am-9am from his room, then he'd hit my office and we'd be up until midnight when he finally wanted to break for supper. I'd get home at 2am, knowing that he may get 2 hours of sleep before he is up and bothering everyone again.

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Eventually i had to point out that i did not have a goal of being wealthy, so my stake wasn't as high as his and I'd be working more reasonable hours.