Hi Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concern...
As per your query you are concerned about
premature ejaculation & nightfall( leakage of semen during sleep). First of all, Nightfall is not a disease & i would not recommend you taking any medicines for this. It is a physiological phenomenon. When seminal vesicles are full of semen and frequency of
masturbation or sex is low, excess semen comes out on its own or due to some dream during sleep. As your frequency of sex or masturbation will increase nightfall will decrease on its own.
Also premature ejaculation is mostly psychological & rarely functional. It is often related to over-excitement,
anxiety, guilt etc. Men often learn to control their ejaculation with sexual experience. So you would be fine, Also first try to know what is normal size of penis. Average penis size is 5 inch on erection, so don't worry about its size.
Don't worry you would be fine
Hope this information helps