Under normal circumstances, when a man experiences sexual excitement, his penis will erect; After the sexual impulse subsides, the penis returns to a weak state. Under physiological conditions, from a child aged one or two to the elderly, penile erection can occur. Teenagers are in their adolescence, and penile erections are more frequent. As we have already known, the reason why penis erection and weakness occur is related to its anatomical structure and physiological function.
After adolescents enter the puberty stage, due to the awakening of sexual consciousness and the emergence of sexual psychology, they will have certain sexual impulses and desires. If you are exposed to some sexual stimuli in your life, such as admiration for the opposite sex, watching movies or books about love plots, having sexual erotic dreams during sleep, and the friction of tight pants on the genitals, you can trigger an erection of the penis.
All this is not a pathological phenomenon, but a political party phenomenon. Some people also experience penile erections during sleep, but the frequency and timing of penile erections vary with age: Adolescent adolescents can have an average of about 6 erections per night, with each erection lasting about 20-30 minutes: young adults have an average of 1 to 1.5 hours; After middle age, the number of penile erections decreases; Healthy elderly people aged 65 can still have several erections per night. "Just because these erections occur during sleep, the person involved is not aware of them.". The presence or absence of a penis erection during sleep is a reliable indicator of whether the penis can erect in a conscious state. "The ability to erect the penis during sleep indicates normal sexual function, and even impotence is psychogenic (spiritual)."; When the penis cannot erect during sleep, it is organic impotence, which can be seen in diabetes, nerve damage or vascular penis obstruction.
Our internal organs are innervated by sympathetic and parasympathetic nerves, and sexual organs are no exception. Penile erection is controlled by the parasympathetic nerve of the sacral cord. When the parasympathetic nerve is excited, the penis will erect.
Both sympathetic and parasympathetic nerves have a certain amount of tension (i.e., weak and sustained excitation), and they fight each other like a seesaw. When the sympathetic nerve is excited, the parasympathetic nerve is relatively suppressed. During the day, the sympathetic nerve is relatively dominant under various stimuli from the environment; During quiet and sleep at night, especially during allopathic sleep, when parasympathetic nerves predominate, there is a phenomenon of male penis erection and female genital congestion. There is a folk rhyme: "When men start writing at the third shift, the lotus blossoms in the middle of the night." This indicates that predecessors have long observed this physiological phenomenon. Therefore, after falling asleep at night, penis erection is not a pathological condition and does not require treatment.