Wet dreaming is when a man releases sperm when he is sleeping. It can happen to any man. It mostly affects young men but adults can experience them too. Usually as you grow up you will have wet dreams less often. Wet dreaming is natural and nothing to worry about-it just shows that you are sexually functioning. Wet dreaming does NOT mean you need to have sex. It is also not a sin nor a form of fornication. Some people do not ever have wet dreams, which is also fine.
Attribution: Straight Talk Foundation & Marie Stopes