Why not wake up early?

Morning erection is a physiological phenomenon that has always existed in newborns to elderly men. Generally speaking, morning erection occurs in the morning, generally showing 2-6 times per night, each time the penis spontaneous erection lasts for 10-15 minutes, and most of the morning erection occurs in sleep and is closely related to sleep. Most people do not feel morning erection in the morning. In the morning, there is no morning erection, and the duration and hardness of the penis erection are insufficient when it is accompanied by sexual life. At this time, it is considered that the erectile dysfunction is displayed, and it is often necessary to do the night penile erectile function test. After the experiment to determine whether there is erectile dysfunction.