What is the reason for a penile erection at midnight?

Patient's question:

Medical history: Erection of the penis at night, affecting sleep
Previous treatment and effectiveness: Taken Chinese medicine and some Chinese patent medicines, with general effectiveness
What help is desired: Timely treatment and understanding the cause

Doctor's answer:

The "erection" of the stem during deep sleep is a "instinctive" phenomenon, not a disease, and is not considered strange. When sleeping, nerves release control over the peripheral nerves, and the penis becomes "unconsciously erect." Due to this "instinct," clinically, when determining whether it is true "impotence," a "bandage" is wrapped around the penis. If it "erections" during the night, the bandage breaks, indicating "false impotence." If the "bandage remains intact" all night, it is "true impotence." There is a problem. Drink more water, avoid smoking and alcohol, and avoid spicy foods. Avoid sitting for long periods, overexertion, and excessive sexual activity. Seek medical attention and treatment as soon as possible.