Charles Spurgeon Commentary Acts 16:9

"And a vision appeared to Paul in the night: There was a man of Macedonia standing, beseeching him, and saying, Come over into Macedonia, and help us." — Acts 16:9 (ASV)

Our dreams often follow the leading thoughts of the day; or, if not of the day, yet the chief thoughts that are on the mind. Where the mind goes when we are awake, it often goes when we are asleep.

Paul dreams about mission work, for his heart is in it. I should not wonder if some before me, who are deeply engaged in earnest Christian work, have often dreamt about their Sunday school or their mission station. This vision that appeared to Paul was supernatural and was an indication of what God wanted him to do.