Dream of dating a blind person
Dreams ease repression by permitting these memories to be reinstated.A study showed that sleep does not benefit the forgetting of unwanted memories.However,the brain is very plastic (able to change) so with the proper stimulation it might be able to perceive something to the effect of color.
The concept of 'repression' dates back to Freud, whereby undesirable memories can become suppressed in the mind.
Your question asks about people who are congenitally blind, that is they have not seen since they were born. One kind is where the retina is damaged, in which case the receptors are damaged.
Another case is where the optic nerve, which sends information from the receptors to the brain, gets severed.
As with many things concerning the brain and unconscious thought, there is so much that remains unknown about dreaming. As technology and new research techniques are developed, the understanding of dreams will continue to grow.
There are five phases of sleep in a sleep cycle: There are significant differences between the neuroscientific and psychoanalytic approaches to dream analysis.
A philosopher by the name of John Locke wrote about this when he spoke about the Inverted Spectrum problem.