Daniel 2:19 - Matthew Poole's English Annotations on the Holy Bible

It is not improbably conjectured that Daniel spent the night in watching and prayer, for night vision is distinguished from dreams, Numbers 12:6; whether sleeping or waking, Daniel had the same thing revealed unto him which king Nebuchadnezzar had, with this difference, the king remembered not his dream, nor knew what it meant, but Daniel was able to tell his dream and give the meaning of it also. Daniel blessed the God of heaven; he gave thanks and praise to the Father of lights, from whom all wisdom comes, who heard his prayer, and revealed this secret to him. Note, this was revealed to Daniel, and not to his companions, for he was chief, and by this is signified by what steps he rose up to the degree of a famous prophet. Again, he calls the true God the God of heaven, because he made heaven, his throne is there, and the magicians and heathen gods come not there, but were cast out thence, being devils of hell; but the God of Israel is the God of heaven.