Many men find that they sometimes have an erection when they first wake up in the morning, and some men think that this is a sign of strong sexual performance. However, if you find that this condition disappears one day, you will be worried and think that your sexual ability is not good enough. The penis of a normal man is usually in a flaccid state, except when it gets erect during sexual stimulation and some kind of external stimulation. However, sometimes the reflexes of the internal organs can also cause the penis to erect. The most obvious is that the penis is often erect in the morning before waking up, the medical term “morning erection”. This condition may be related to erotic dreams or an increase in pressure in the bladder due to excessive urine storage, causing a subconscious, reflexive erection of the penis. In fact, not only do men have unconscious erections in the early morning, but they also have them during deep sleep. This erection usually occurs during the intermittent period of rapid eye movements, i.e. during the dreaming phase. This is the time when penile erection is usually not disturbed by psychological factors, and can be a more realistic expression of male sexual function. Generally speaking, men will have 3-5 erections every night and each erection lasts an average of 15 minutes, as long as the nerves, blood vessels and the structure and function of the penile corpus cavernosum are normal. Clinically, when diagnosing whether a man has organic ED (erectile dysfunction), a professional hardness meter is often used to check the erection status at night. This test is very important for the differential diagnosis of physical ED and psychological ED. Some men who suspect that they are not sexually capable because they find that their morning erections have decreased may find that they do not have erectile dysfunction after having this test. At present, the exact mechanism of early morning penile erection has not been studied. In any case, there is no doubt that early morning penile erection is a normal physiological response for men. As each male has different variations due to individual differences, a normal male should not judge his sexual ability only by the presence or absence of morning erection. Sometimes excessive fatigue and other physical problems may also lead to abnormal nighttime erections. Some middle-aged and elderly men, once they find no morning erection or morning erection is not firm, they suspect that they are suffering from erectile dysfunction or sexual insufficiency, so they worry, and the more they worry, the less the morning erection is. This is a terrible vicious circle, because psychological uneasiness and negative self-reference will lead to physiological abnormalities in function; and physiological abnormalities in function will in turn induce further psychological uneasiness, and so on and so forth, and the situation is getting worse and worse. Therefore, it is recommended that you consult an experienced doctor in a regular hospital when you are ill, and not to guess and use drugs on your own.