Dear Welcome to HCM We understand your concerns I went through your details. Automatic sperm leakage during sleep is called nocturnal emission. Nocturnal emission is a natural process of body on which you have no control at all. Semen is produced whenever you are sexually aroused and this produced semen is stored within the body. This semen is a waste product and body should find a way to throw the semen. Body does it through nocturnal emission. No health problems due to nocturnal emission. You could be having premature ejaculation problem which you term as lack of stamina. In reality stamina is not the criteria for premature ejaculation. in most of the cases, mental health issues like anxiety, apprehension and obsession are the reason for premature ejaculation. I suggest you to consult a psychologist for counseling. If you require more of my help in this aspect, please use this URL. http://goo.gl/aYW2pR. Make sure that you include every minute details possible. Hope this answers your query. Available for further clarifications. Good luck. Take care.