Solution
1)before sleeping, do brahmacharyasan. This asan definately will reduce your nightfall problem.serch in youtube for information.
2) before sleeping, wash your feet with cold water or normal water… And dry your feet…use mustard oil for massage…
3) don’t eat junk food. Don’t take food from the person who cooked the food & is always thinking about sexual thoughts. Try to eat in your home made by mom 
4)don’t think about sexual thoughts…once you thought and erected your penis for 2 sec …then it may create a nf.
5) don’t drink water or liquid in the night…never drink water before sleeping
6)before sleeping do some postive affirmations.
7)at last don’t think nightfall is a problem if it happens 2 times in a month.
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