That night was known as "nittel nacht," and traditionally local Christians would attack Jews during that night. As a result, the Chassidic communities of Europe came up with a set of customs for that night, mostly for self-protection.
Here is a very comprehensive article about it.
In 1905, a Cleveland writer named Martha Wolfenstein published a set of short stories, written for the general public, about various Jewish topics, and one of her stories seems to be a fairly accurate description of how nittel nacht was experienced in Bohemia in the mid-1800s. Although nothing tragic occurs in this story, some of its matter-of-fact depictions of daily anti-semitism that European Jews had to endure are jarring - as well as their dreams to return to Jerusalem, where they would no longer have to worry about such things.
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