C. F. Keil and Franz Delitzsch on Esther 6:1

Est 6:1

An unexpected turn of affairs. Est 6:1. On that night between Esther’s first and second banquet, the king’s sleep fled, and he commanded to bring the book of records of the chronicles and to read therefrom. On הזּכרנות ספר, comp. Ezr 4:15. The title is here more particularly stated than in Est 2:23, where the book is briefly called: The book of the chronicles. נקראים ויּהיוּ, and they (the chronicles) were read before the king. The participle denotes the long continuance of this reading.