Morning erection but not hard after peeing is a normal physiological phenomenon. Morning erection is a relatively common physiological phenomenon. Generally normal male in the night sleep state will be due to the sympathetic nerve excitation, the inhibition of erection after the release of the phenomenon of erection. When a man wakes up to urinate, without sexual stimulation, not able to sustain an erection, then the morning erection will disappear more quickly. The decrease or disappearance of erection does not mean that there is a problem with the man’s sexual function. It may be caused by poor sleep quality, stress, or unstable androgen levels. If the phenomenon only occurs for a short period of time, it may be caused by physiological factors. It can be improved by expressing the pressure in your heart and adjusting your sleep. If you are more worried, you can also go to the hospital for a relevant examination, and take corresponding measures to regulate the condition of the body.