Well firstly I believe the soul cannot die, and hence more than one lifetime - taking on different forms, like animals, I'm not so sure about... but anyway.
I had a dream once that I was walking through this art gallery type space, which eventually led to a large glass pyramid. And then, having been to Musée du Louvre in Paris on a school art trip a few years later, I saw the exact images that I did in that dream... it's like Deja Vu, but I know I dreamt it. I also know, for fact, that I have never even been to France, nor visited, or seen images from an eye-view inside The Louvre in my lifetime.
This isn't the first time I have seen images in my dreams before witnessing them in real life, but it's really creepy.
So really it's a question of do fate and destiny exist, and if so, can they truly be determined in dreams? If not, then surely we have witnessed these images in another life? It's like Ayanna said, dreams always have some sort of meaning that affects us in some way or another.
Like I've had a dream in which I got so unbelievably pissed off with my best friend and tried to do as much harm as I could to them for what they did, yet couldn't because my imagination wouldn't let me. I woke up that morning thinking "Jesus, I ****ing hate him!" Maybe I'm just weird like that, but it happens. Until I had a shower and properly woke myself up, I was convinced I despised one of my best friends cos of whatever happened in this dream.
Bottom line - it's not possible to produce these weird and wonderful images if there's nothing visual to base them on. But just to confuse myself... if you spent a lifetime blinded from the world and it's existence, how exactly would the ability to imagine work, if there's no visual references to shape, form, colour, etc to base them on?
Okay, I'm getting too philosophical and confusing for my own good... *shuts up*
Either way, I think dreams are a visual representation of another life which we can only access through our imagination.