hi.. thanks for writing..i have understood your concerns.. when you were masturbating you didnt have night fall..from this you can understand that nightfall is prevented by masturbation.. our body has sexual glands which produces semen continuously and the storage capacity of these glands is limited..so if you are not masturbating then it will accumulate and at one point all the storage is full.now where it will go? it will overflow.. it will come out through penis whenever there is erection either in night or due to excitement at any time..it will also pass with stool and urine whenever there is increase in abdominal pressure.. when person masturbates regularly 2 to 3 times a week..then storage is emptied regularly so there is no overflow of semen...and night fall will be gone.. masturbation is not a bad habit..it is common, more than 90% of men practice it..it does not cause any sexual or physical weakness..so continue masturbation with frequency of 2 to 3 times in a week..and your night fall will be gone.. i hope this will be helpful to you..best of luck..