Your concerns about health problems due to wet dreams (swapnadosh) are based on misconceptions that are very popular in some cultures. Stay away from misleading information from friends or other unreliable sources.
It is important for you to undestand that semen is continually produced in our body. In the absence of masturbation
or sexual activity, it is natural for the semen to be released during sleep. "swapnadosh"(wet dreams) are normal and completely harmless to our body