Hello there, I understand your concern regarding this issue. However I assure you that Night Fall is a physiological process which gives out unwanted and excess sperm along with fluid so you need not worry about it much. Secondarily your weakness isn't related to your nightfalls. During sexual excitement initially prostatic fluid comes, this can also happen during a dream, thus known as wet dream. I suggest you to have your diet properly and focus on your hobbies and likings. If you've any queries please don't hesitate to ask. Hope this helps.