Revelations may come by dreams.

Now there’s one more way by which revelations may come, and that is by dreams. Oh, I’m not going to tell you that every dream you have is a direct revelation from the Lord. … But I fear that in this age of sophistication there are those of us who are prone to rule out all dreams as of no purpose, and of no moment. And yet all through the scriptures there were recorded incidents where the Lord, by dreams, has directed His people. …
The thing that all of us should strive for is to so live, keeping the commandments of the Lord, that He can answer our prayers, the prayers of our loved ones, the prayers of the General Authorities, for us. We always pray for the members of the Church, and we thank God when we know that they are praying for us. If we will live worthy, then the Lord will guide us—by a personal appearance, or by His actual voice, or by His voice coming into our mind, or by impressions upon our heart and our soul. And oh, how grateful we ought to be if the Lord sends us a dream in which are revealed to us the beauties of the eternity or a warning and direction for our special comfort. Yes, if we so live, the Lord will guide us for our salvation and for our benefit.
Author: Harold B. Lee
Source: www.churchofjesuschrist.org/study/manual/teachings-harold-b-lee/chapter-6?lang=eng