Use "in his sleep" in a sentence

1. However, very differently, another historian Lactantius, says: “Constantine was admonished in his sleep to mark the celestial sign of God on the shields, and thus engage in battle.”

Lactantius, ein Kirchenschriftsteller, berichtet aber, Konstantin sei in einem Traum ermahnt worden, das „himmlische Zeichen Gottes auf die Schilde zu malen und dann in den Streit zu ziehen“.