Dreams...can they predict something?

This has started to bug me quite a bit. I had a dream a little while back dealing with some good friends of mine, it's somewhat hard to translate, but I was sad, and the way I translated it was, I may never see them again. It's hard to tell what real meaning dreams have in this world, but this one in particular hit me right to the core. If I never see them again, I wish them the best and hope their lives run smoothly. I pray that I have no more haunting dreams, everything always seems to be based on bits and pieces of my memories...