hi doctor , i am 21 years old and facing nightfall problem ,it started from an age of 14 year , firstly i started masturbating and then after some days , this problem of nigthfall arises in my body and continued uptil now , now i m totally fedup from this , now i don't masturbate but night fall occurs , i don't know what to do doctor , plzzzz help me .tell me some exercise or natural solution to cure this problem of mine.