At night when sleeping, how can one experience an erection without realizing it, and what is the reason?

Patient's question:

Started ejaculating since I was 16, it always happens when I'm sleeping. It happens about two or three times a month, and it's been like this ever since. I'm 18 now.

Doctor's answer:

Ejaculation without sexual intercourse is known as nocturnal emission, a common normal physiological phenomenon among adolescents. Approximately 80% of unmarried young men have experienced this phenomenon. Ejaculation that occurs during sleep while dreaming is called "wet dream," while ejaculation that happens while awake is referred to as "slippery ejaculation." The frequency of nocturnal emissions varies greatly. In normal unmarried men, nocturnal emissions can occur 2-8 times per month without any abnormalities. However, when engaging in regular sexual activity, frequent nocturnal emissions or an increase in their frequency—such as several times a week or multiple times in a single night—occurring even with just sexual thoughts, often indicates a pathological condition. The causes include:
1. A lack of proper sexual knowledge, excessive focus on sexual matters, or long-term habits of masturbation;
2. Irritation from localized lesions of the genital organs (e.g., phimosis, excessive foreskin, urethral inflammation, prostatitis, etc.).

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