Hi,
As you said that you are having this problem for a pretty long time, I have to say that it is important for you to know what exactly is night fall. Night fall is a problem which is faced more by men. The reason is that in females the secretion is too less for them to realize that they had a night fall. Males mostly have this problem in their teenage.The problem may be as infrequent to once in two months and to as frequent as once in every second day.
Well there is no sure shot cure for it ...
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