Can people's dreams come true?

Things in dreams don't necessarily happen in reality, and there is no necessary connection with things that may happen in reality, and there is no so-called "sign".

When you are in a dream, you will think that this is the "real" world. However, when you wake up, you will soon forget this dream, leaving only a little trace of memory. A few hours later, you can't remember what you dreamed last night for any reason. Therefore, this dream will be temporarily forgotten by you. Then something happened to you, even some changes, and you suddenly remembered the situation in your dream.