Fantasy Land of Dreams

Since the emergence of "dreams", human beings all over the world have "evolved". Why do we dream, and where will "dreams" lead us. When what happens in a dream becomes a reflection of your reality, then how do we distinguish whether it is a dream or reality? "I have encountered all kinds of misfortunes, but my dreams are still sweet." When the "dream" comes, all human beings' "nightmares" disappear. It seems like this is a beautiful thing. In the fantasy land of dreams, everyone's dreams are beautiful. Why is everything I see, hear and know "evil"? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.