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The babies I know yet don't sleep like adults which means that you will be up at night at random hours that you are not used to and I think this has nothing to do with industrial work culture. That 6-8 hours of uninterrupted sleep is just a "dream" :).

I recall, as a twins dad, I did not have 2+ hours of uninterrupted sleep till they are 2 years old. (This depends on the kid though).

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Prior to the industrial revolution polyphasic sleep was pretty standard:

https://en.wikipedia.org/wiki/Polyphasic_sleep

That article does not say whether polyphasic sleep was standard because parents were synchronizing with their babies.

The polyphasic sleep schedule was aligned with darkness, not random times throughout the day. Daylight was far too valuable for that.

This varies, you still see some polyphasic sleep in countries that have very hot middle of the days, Greece + Spain off the top of my head. An intentional waste of daylight because the cooler mornings and evenings are better, but industrialisation has still reduced the frequency of these practices.

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