Sightless dreams are made of these

Q. What do blind people see when they dream?

A. I have absolutely no idea. But I thought this was a good question so I consulted a global system of interconnected computer networks to see if I could find an answer. In a nut encasement this is what I learned:
People who were once sighted, have visual dreams. The longer they had sight, the more vivid their dreams.
People who were born sightless or lost sight at a very early age dream in sound, sensation and emotion.