If someone has been blind from birth can they dream?

[Paulacrazyplaits]

What do they dream of as they have no concept of how things really look or do they dream of the way their brain thinks the way the world is?

[heathfield]

They dream of things by touch, smell, and hearing.

[jomifl]

I believe dreams begin as concepts or feelings which are tranformed into a model of the world using whatever sense is applicable or available. That is why you can wake up feeling terrified without having 'seen' a mental image of terror.

[scowie]

Even without sight, blind people will still make mental images of things, which is basically what we do when we dream.

I dont think I have ever had a dream in which anything had a particularly vivid colour. I dont think dreams are really as "visual" as you think they are, even for the sighted.