People have always been interested in dreams. After all, who doesn't have some interesting or wonderful dream experiences? In fact, why dreams exist is a puzzling problem in itself. Sleep is not rest. Why do you have to dream when your brain is resting?

The current answer to this question is regrettable: in fact, researchers don't know why. However, they still put forward many enlightening conjectures, which can be further understood by poking at the original text.

What I want to talk about here today are actually two questions about dreams that people often ask.

1: Is there anyone in this world who can't dream?

The answer is, yes, at least now we can find the case reports of brain injury leading to dream loss in medical literature, which is called Chaco-Wilbrand syndrome.

A paper reported that a 73-year-old woman had a stroke, acute bilateral occipital artery infarction (including the right hypoglossal gyrus), and then she lost her dreams. Even though she was awakened from REM sleep many times, she denied that she was dreaming.

Of course, it is more common in life that people who feel that they have never had a dream actually forget the content of the dream.

2. Can blind people dream?

The answer to this question is yes, too. Blind people can dream.

So, do their dreams have pictures? The scores have been discussed. Congenital blind people have no pictures in their dreams, and later blind people will have visual images in their dreams.

There are also research papers investigating the dreams of the blind. The results show that people who are blind at birth and very young have no visual part in their dreams (it can be said that their dreams are mainly "auditory dreams"), but a high proportion will experience taste, smell and touch.