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The title of Philip Wylie's novel was taken from the Nineteenth Psalm, "Day unto day uttereth speech, and night unto night skeweth knowledge." After the novel was purchased by Warner Bros., a January 21, 1946 Daily Variety news item speculated that Bette Davis would play the part of "Ann." The film was originally intended to be Viveca Lindfors' American debut, but its release was delayed, and by the time the film was finally released, Lindfors was no longer under contract to Warner Bros. Lindfors and director Don Siegel married in 1949. Night Unto Night was the only film on which they both worked.