This prophecy is suprising according the Maimonidean view that prophecy is the perfection of the intellect and its joining with the God's intellect (an admittedly gross simplification of a complex view; for a fuller picture, see Maimonides and Abrabanel on Prophecy). How could Lavan have achieved prophecy? Did he really have such an accomplished intellect?
The answer is in Moreh Nevukhim 2:41 (Hebrew, English):
[T]he phrase, "And Elokim came to a certain person in the dream of night," does not indicate a prophecy, and the person mentioned in that phrase is not a prophet; the phrase only informs us that the attention of the person was called by God to a certain thing, and at the same time that this happened at night. For just as God may cause a person to move in order to save or kill another person, so He may cause, according to His will, certain things to rise in man's mind in a dream by night.In other words, what Lavan (and Avimelekh -- Gen. 20:3) had was not a prophetic dream in which they connect with God but just that God influenced them to dream that an angel spoke to them.