Nightwall usually is a result of suppression of sexual thoughts by your concious and sub concious mind. If you want to be successful with Nofap you must abstain yourself from looking at any kind of inapropriate content online which stimulates your sexual desires. If the urge naturally comes to the surface of your mind then observe your breath and understand the nature of it with equanimity. You will realize any urge, no matter how powerful it is, will pass away if you maintain equanimity. This way you reduce the chances of nightfall.
But still if Nightfall happens, it is not considered as a breaking of Brhamachariya Sila or vow and I have reconfirmed this with monk and teachers. It is just a natural way to flush out your suppressed energy.
Brhamachariya doesn’t mean just abstaining from sex or masturbation but also maintaining purity of thoughts. The true qualities of Brhama i.e pure love, kindness,empathy and equanimity can only be developed if you triumph over your lust, anger, greed and attatchments by practising Sila(Morality), Samadhi(Concentration of mind) and Pragya (Insight meditation). This is in true sense Brhama Acharan, i.e Brhamachariya.
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