The study confirms an already existing hypothesis that people’s nightmares are associated with emotions they experience while awake. And blind people apparently experience more threatening or dangerous situations during the day than people with normal sight.
Research results showed that approximately 25 percent of a born-blind person’s dreams are nightmares, compared to only six percent for a sighted person. The dreams of people who became blind later in life were more similar to sighted people with nightmares at seven percent. The nightmares were typically related to fears experienced in everyday life, such as being in an embarrassing social situation or a car accident.
Because people who lose their sight later in life have previously seen their surroundings it might be that their brains do not experience being threatened by circumstances to the same degree as people who are born blind.
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Source material from Psych Central