Up to now, people have always thought that he discovered the regularity of the periodic table in his dreams.
Personally, I think it is possible to dream that a snake bites its tail, but this is not the main reason, because many people are like this and always like to tell everyone that their achievements are luck or how mysterious they are. They were modest or humorous, but they were believed.
Sewing machine? I think either his wife is fierce, or he loves his wife dearly, dreaming that people forced him to do this, and then trying to study it, so there is nothing mysterious.
As for dreaming in a dream and then dreaming again, repeating two or three layers, I often do this, and it's nothing.
I also have the same dream over and over again (some books have made a reasonable so-called "scientific" explanation for this phenomenon), especially when I was a child, I always dreamed of a place, and then the same thing happened, and then for a long time I wondered if it was my past life.
Then I often dream that I am dreaming, and then I know that I am dreaming, forcing myself to wake up, but my hands and feet can't move, my chest is stuffy, I have difficulty breathing, and my head hurts. But I happened to see someone with the same situation in a magazine and consulted a doctor, and I explained it.
I didn't know how to ride a bike before. I learned to ride a bike at the age of six or seven, and I got my own car at the age of nine-but I never knew it, but the children in the yard could ride it at the age of five or six, so I always felt ashamed and dreamed that I could ride a bike myself. As a result, for a while, I dreamed that I could ride a bike every day (although it took me a long time to really learn).
Similarly, I dream every day that I can skate backwards (I haven't learned it yet), and then I can play inline skating (I haven't played it yet).
So, to sum up, I don't think you can learn what you don't know in your dreams.
But if you accumulate some knowledge,
Think about a problem for a long time
If one day I suddenly thought of it in my dream, it is also possible.
This is because you have mastered all the knowledge yourself, and your knowledge thinking has not spread out. What you think in your dream is only an exciting process, not a learning process.
As for the examination questions, I always dream that I was awakened by something when I was about to read them.
However, it is said that someone dreamed about the exam questions.
I haven't experienced it myself, I don't know.
As for the reason of dreaming, I have seen it before because of what happened during the day or because of overthinking, and then I was left in the cerebral cortex when I slept.
Personal theory: (I always thought it was correct, and it took me a long time to come to a conclusion, because I am a sensitive physique with insomnia and dreams, and my health is really not very good. When people fall asleep, their bodies are in a relatively static state, and they feel more sensitive than usual, so if you often dream that someone is uncomfortable (or because others hit you or touch you) and that place is always uncomfortable, it is because you have some kind of disease. As for jumping off a building in my dream, I grew taller because my feet and body were uncomfortable. When you appear in a dream, you will fall from a height or fly, or jump on a spring.
Anyway, I suddenly found that I typed so many words, and I was tired.
Landlord, you are too stingy.