I get what you're saying, but let's not pretend the modern world isn't meaningfully different. Artificial light is a big factor, yes. So are odd and constantly changing work hours from a world that now operates 24/7. So is the common expectation of monophasic sleep in general. So is travel and jet lag that we now have to endure, and dietary changes, and stimulants especially for folks who just don't even have 8 uninterrupted hours available for sleep. So are dramatic global temperature changes. The list goes on, and there is more data in this paper https://pmc.ncbi.nlm.nih.gov/articles/PMC11152632/

I can hardly blame anyone for wanting to "hack" or "optimize" their sleep. It seems more necessary now than it has ever been.

I know an obese individual who has one and I'm sure having a ventilated bed helps them sleep more comfortably.

Are you sceptical if people have slept before 1600, or what's with the "at least?"

I wonder what the actual sleep quality of people 400 years ago looked like

My guess would be "not great"

Sure and health-science hasn't improved since then right?

at least!