In general, an erection at night due to holding in urine is not considered a morning erection.
A morning erection is a natural erection that occurs in the early morning when a man’s penis is not under the control of his mind, movements, or circumstances. In the evening, the time between sunset and late night, when an erection occurs due to holding in urine, is usually not a morning erection.
The exact mechanism of morning erection is not very clear, it may be related to age, disease, drugs, mental, holding urine, etc. Generally speaking, morning erection is a normal physiological phenomenon, if there is no abnormality in the body, there is no need for treatment.
However, there are some patients in the morning after the disappearance of the phenomenon of the penis can not be erected, this situation will need to go to the hospital in time for examination.