And the king said unto them, I have dreamed a dream, and my spirit was troubled to know the dream.

Wesley's Notes

2:3 To know - He remembered the fact in general, but could not repeat it perfectly. Yet it had left such an impression on him, as put him in great perplexity. The Lord hath ways to affright the greatest men in the world, in the midst of their security.

Jamieson-Fausset-Brown Bible Commentary

3. troubled to know the dream-He awoke in alarm, remembering that something solemn had been presented to him in a dream, without being able to recall the form in which it had clothed itself. His thoughts on the unprecedented greatness to which his power had attained (Da 2:29) made him anxious to know what the issue of all this should be. God meets this wish in the way most calculated to impress him.

Matthew Henry's Concise Commentary

2:1-13 The greatest men are most open to cares and troubles of mind, which disturb their repose in the night, while the sleep of the labouring man is sweet and sound. We know not the uneasiness of many who live in great pomp, and, as others vainly think, in pleasure also. The king said that his learned men must tell him the dream itself, or they should all be put to death as deceivers. Men are more eager to ask as to future events, than to learn the way of salvation or the path of duty; yet foreknowledge of future events increases anxiety and trouble. Those who deceived, by pretending to do what they could not do, were sentenced to death, for not being able to do what they did not pretend to.