Why do men have morning sickness?

A normal male, early morning sleep, due to the influence of urine retention stimulation and show spontaneous erection, so talk about morning erection is mainly caused by urine retention. Morning erection phenomenon is more common in young adults, and the number of morning erection will gradually decrease with age. In addition, morning erection is also related to sleep quality. Adequate sleep, coupled with the stimulation of urine retention, can also show morning erection, so insomnia patients will reduce morning erection. But morning erection is not an important standard for male sexual function, so there is no need to worry too much about whether there is morning erection.