How can I dream when I want to sleep?

First of all, I want to tell you that when people dream, their will is very weak. I want to know whether I am sleeping or dreaming, which is related to brain waves! Brain waves and the power of human will ... wait ... I have studied it before ... Well, now I forgot that dreaming in the middle of the night is generally related to daily life. The human brain is magical. What you do during the day is generally reflected in the subconscious when you sleep at night, so you can dream whatever you want, mainly depending on the strength of your brain waves and will when you sleep. If you are strong-willed, you can control your dreams freely, but it is usually very unlikely. But this "will" will only play better in dreams.