Every morning when I wake up or even if I wake up in the middle of the night, I find my penis to be hard and erect. This always happens every morning. And after I pee, it becomes normal. While erection is healthy when thinking/ dreaming about something sexual but every morning getting erection without any reason irritates me. Also probably because I masturbate a lot or may be some other reason but whenever I try to masturbate with full force and pleasure, I ejaculate very fast and don't last long. Request you to suggest me what to do.