Night fall upto once a week is normal in unmarried males who don't masturbate. If frequency is more,then it needs to be treated. Treatment is available in Ayurveda.

Night falls are a natural phenomena. But when we start having night falls more than 4-5 times a month， then there is a problem. We start feeling weakness， tiredness， etc.. Do not take milk after 3 pm. Try to avoid non-veg， spicy， fried & chilly food. Do not watch pornography materials. Take good healthy diet， do exercise & yoga daily. Take tab. Confido & chandan adi bhati each morning & evening with water. Keep stumic clean & avoid constipation.