Morning erection is a normal phenomenon, morning erection is a normal healthy male in the early morning, the penis in the unconscious situation, without any internal and external factors control and natural erection, morning erection is the normal sexual function important performance. Impotence is affected by diseases and subjective and objective unfavorable factors, the penis can not be normal erection or erection is not firm, this is the clinical symptoms of male diseases. Impotence is a manifestation of abnormal sexual function, so morning erection and impotence is not the same thing, but precisely reflects the male sexual function strength and normal or not, so can not be confused with the two.