Nightfall, also known as nocturnal emissions or wet dreams, is a common occurrence among men. It happens during sleep when a man ejaculates without any sexual activity. While it's a natural process, understanding its causes, symptoms, and the available testing and treatment options can help address any concerns. In this article, we'll delve into the world of nightfall and provide you with valuable information on this topic. Causes of Nightfall: Nightfall can be triggered by a variety of ... Nightfall or wet dreams is a natural but often misunderstood phenomenon. To know more about nightfall and how to stop it read the article. Nightfall is considered normal if it occurs in a controlled frequency which is about two nightfall per week. For teen males, the mean frequency of nightfall is approximately 0.36 times a week while for 40-year-old males, the nightfall mean frequency is 0.18 times a week. Nightfall occurs when a man experiences involuntary ejaculation during sleep. This is often triggered by erotic dreams or sexual arousal and is most prevalent during puberty, a time of intense hormonal activity.