I'm male 20 having a nightfall without any wet dream is there any solution?

Nightfall?: Not sure what you mean by nightfall but perhaps you mean ejaculation in sleep w/out dreams. If this is the case not to worry. A young healthy male can have this experience. Remembering dream during ejaculation is not essential. Peace and good health.

It's good for you: Nocturnal emissions are part of normal function for any man who is not having daytime ejaculations with a partner or by himself. You should be proud of it and find pleasure in it. Anybody who's told you it's unhealthy or shameful is either grossly misinformed or is trying to manipulate you. Enjoy being a man, and when the time comes, love responsibly and well.