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Not to mention that the "single quote" in the article is hardly from a "unknown" author (Charles Dickens), this BBC article on the same topic [0] has several other quotes from well known literature in the same period.

[0] https://www.bbc.com/news/magazine-16964783.amp

A single quote? There are whole medieval books about what to do “between the sleeps.”

I'm curious about them; what are some titles?

I don't know about books but this isn't the first time people have written about this. Doing a quick search on "between the sleeps" yields articles from early 2000s and 2010s.

And it’s one of those articles I read which had the tidbit about the books, and even some choice quotes. Not sure which article it was, but google should find it for you.

You could buy the book that sourced those original titles to find out. Authors should be compensated for their work.

The article isn't a scientific enquiry, but it reports on the theme of the book At Day's Close: Night in Times Past (98 citations on Google Scholar)[1]. This book apparently packs a great amount of endnotes and sources.

[1]: https://scholar.google.com/scholar?cites=8924290322670217203...