No, that's a myth. I met a guy who used to get wet dreams when he used to watch porn regularly but now since he started nofap, he is not meeting nightfall as much as he used to. So, just blaming nofap for this, is not 100% true. Many factors cause nightfall or wet dreams.

Does nightfall break brahmacharya?

For me, Brahmacharya means not to waste even a single drop of semen even unconsciously that is in even in nightfall. This may sound a difficult concept because even strict celibates in ashram have nightfall and they justify by giving the consolation that it was not intentional.

Does nightfall affect body?

Dizziness, insomnia, weaker sexual incapacity, erectile dysfunction, knee pain, stress, infertility, and loss of sight and memory are all symptoms of daily nightfall in men. Urine may also accompany the sperm in a few cases.