Visions of the future?

In the literature there is much discussion surrounding the role of memory in dreams. I am of the opinion that dreams consist of past experiences fused with a vision of the future, things to come, things only imagined. It's the vision of the future that makes dreams exciting and scary and meaningful. Some argue that these visions are prophecies from another realm while others say we simply write our own futures according to what we've envisioned. What do you think?