I wanted my slide show to build up layers as it when through the timeline, so it looked like the dreams where developing in from the viewer eyes. To get this effect I had to turn of the visuals on the layers, I then would gradually increase the number of layers visible whist saving as a jpeg until I had a full picture.
I then imported these images into After effects arranging them in the order that I wanted then to build up in, I to help me fade some of my images into each other I adjusted the opacity, to create a fade in transition.