Midrasch zu Esther 6:5

“That night, the king’s sleep was disturbed; he said to bring the book of records, the chronicles, and they were read before the king” (Esther 6:1).
“That night, the king’s sleep was disturbed” – The heavens disturbed the throne of the king of kings, the Holy one blessed be He, who saw Israel in distress. Does the Omnipresent sleep? Does it not already say: “Behold, the guardian of Israel neither slumbers nor sleeps” (Psalms 121:4)? Rather, at a time when Israel is immersed in trouble and the nations of the world are at peace [it is said allegorically that God is sleeping, and] for this [reason] it says: “Rouse Yourself; why do You sleep, O Lord?” (Psalms 44:24).
King Aḥashverosh’s sleep was disturbed as he saw in his dream that Haman took a sword to kill him; he was frightened and awoke from his sleep. He said to his scribes: ‘Bring the book of records,’ to read and to see what had happened to him. They opened the scrolls and found the matter that Mordekhai reported about Bigtana and Teresh. When they said to the king: “Here is Haman standing in the courtyard” (Esther 6:5), the king said: ‘The thing I saw in my dream is true. This one would not come at this hour except to kill me.’