Nightfall is result of excess semen in our body and we can never control it fully but can reduce it by changing our physical diet. Beyond our consciousness and it will get ejaculated automatically and you will realise the ejaculation in awaken situation.
Wet dreams are the result of our past mental feeding…i.e. we watched porn, and continues thinking about someone with whom we want to ejaculate and it get registered in our subconscious mind. These memories get stored in our mind and we see the same dreams doing sex with someone else and wet dream happens.
We can totally remove the wet dream by making our thinking clear and pure like not seeing fascinating picture and videos, no porn, no bad thinking in alone time, by doing meditation and feeding only positive information and knowledge. It is my personal experience and till now, i didn’t get wet dream but night falls happens sometimes and when i used to watch porn i get wet dreams a lot.
both ejaculations can never set our counter zero again