Hi Thank you for asking HCM. I have gone through your query. Coming out of semen during sleep is normal. when storage of semen is full it is physiological to ejaculate during sleep. Main cause of premature ejaculation is anxiety. This can be general anxiety or performance anxiety. So controlling this by performing breathing exercises daily will be helpful. Be relaxed. If not helping then do a counselling by a psychologist. You can do stop and start technique , use condom with numbing agents like anaesthetic , use sex positions which give less sensitivity to penis , thought changing when nearing ejaculation. If above measures are not helping then approach your doctor for prescription medications like DAPOXETINE (SSRI group) which can be taken prior to intercourse. Hope this may help you. Let me know if anything not clear. Thanks.