Then I heard him speaking, and as I listened to him, I fell into a deep sleep, my face to the ground. (NIV)
Then I heard the sound of his words; and when I heard the sound of his words, I fell on my face in a deep sleep, with my face [sunk] to the ground. (AMP)
Yet heard I the voice of his words: and when I heard the voice of his words, then was I in a deep sleep on my face, and my face toward the ground. (KJV)