Sleeping at night with nocturnal emission is a problem that can occur in the majority of men. Because men gradually mature with their sexual development, generally after the age of 13, they will begin to experience the phenomenon of dream emission, which is called seminal emission. After the male testicles produce sperm, it gradually matures in the testicles and is stored in the epididymis and seminal vesicles. When the stored semen reaches a certain amount, and after being exposed to many sex-related words and pictures during the day, and after the penis becomes erect at night, the phenomenon of dream ejaculation will occur. Especially, there are many men who always have sex-related dreams at night and may have more dream loss.