Do you ever Wonder If blind people(acquired congenital)Dream in their sleep?

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I always dream in my sleep.And throughout the years, I discovered it was a gift gave to me...a warning and a sign to share to my loved ones.It is amazing how every detail of my dreams I remember it.Examples were, my eldest and second sisters having pregnant with their children, their faces is showed in my dreams and before they revealed to me they were pregnant I already knew their genders before they came out from their wombs. Amazingly, though it is such a wonderful experience, I also dream of warnings like 3 months ago, two cousins of mine which I haven't seen physically showed in my sleep dream, looking obese and there was this voice on that dream warning me to tell them to reduced, as the voice says if they WILL NOT, they will have a heart disease that would cause their death. My curiosity is to those with congenital blindness...Not having seen any images, form or light...I wonder how they dream...can they see any images or just sounds are presented in their dream???Remember, since birth they don't have any experience of any images.Dear friends here in my lot any clue or ideas...