My Dear Friend, Night fall is a natural things that happens to all males, there is noting wrong or un natural about it. It does not affect your health. So please do not worry. Also do not waste money on getting treated, as to be frank there is no treatment for it. Night fall is not a disease, so there is no treatment for it, it happens to to all men, even females experience something similar, but in a different way. Most of the time this issue will resole as you grow older. Best wishes.