Now as he was speaking with me, I was in a deep sleep on my face toward the ground; but he touched me, and set me upright. The LXX. joins the opening words of the next verse to this. I was in a deep sleep suggests the case of the three apostles, Peter, James, and John, on the Mount of Transfiguration (Luke 9:1-62 :82).
The numbing effect of the presence of the supernatural produces a state analogous to sleep, yet "the eyes are open" (Numbers 24:4) the senses are ready to convey impressions to the mind. The angel, however, touched Daniel, and set him upright.