Here's an interesting article which shows that the modern tradition of eight hours of unbroken sleep might actually be unnatural, and quite different from what our ancestors typically did:
So, maybe the majority of our modern societies (even the people without recognized sleep disorders) are unwisely fighting against biology?
Perhaps a lot of people's health issues, such as depression, are caused by people trying to force themselves to live according to schedules which, unbeknownst to them, are unnatural for them (and perhaps even unnatural for most everyone)?
As someone with severe sleep issues, I've often found that much of the "depression" I've experienced evaporates when I'm well-rested.
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