"But Peter, standing up with the eleven, raised his voice and said to them, 'Men of Judea and all who dwell in Jerusalem, let this be known to you, and heed my words. For these are not drunk, as you suppose, since it is only the third hour of the day. But this is what was spoken by the prophet Joel: 'And it shall come to pass in the last days, says God, that I will pour out of My Spirit on all flesh; your sons and your daughters shall prophesy, your young men shall see visions, your old men shall dream dreams. And on My menservants and on My maidservants I will pour out My Spirit in those days; and they shall prophesy.'" (Acts 2:14-18)
"In a dream, in a vision of the night, when deep sleep falls upon men, while slumbering on their beds, then He opens the ears of men, and seals their instruction. In order to turn man from his deed, and conceal pride from man, He keeps back his soul from the Pit, and his life from perishing by the sword." (Job 33:15-18)
"Dreams" is one of the topics that many Christians are not aware of. We don't need to avoid it in fear of being related to the occult when we familiarize ourselves with what the Bible has to say on it. Learning what the Word of God has to say on this subject can further equip Christians of all backgrounds.
On one hand, we're never to judge or put down other Christians who don't know much about this truth, but on the other hand, we should embrace what is biblical and what is of God in humility and diligence. The occults and New Age only took what was of God and perverted it, and misused it with the wrong motivation and purposes. We should never throw the babies out with the bath water. This also applies to many spiritual truths, especially those qualities of biblical faith, such as visualization, confession etc.
There are just way too much to cover about this subject thoroughly and systematically in limited time and space. However, I just want to focus on the most important principles on dreams, and zoom in on the interpretation of allegorical (spiritual) dreams, because most (over 90%) spiritual dreams will be in this category (there are exceptions of course).