Hi. night fall is the condition wherein some men ejaculate during their sleep in the early mornings or late nights. The problem of nightfall gets enhanced due to hormonal fluctuations, consumption of
testosterone drugs, full bladder etc. Men can hold certain amount of semen but its excessive contents get discharged through nightfall.
It may be noted that the men suffering from considerable nightfall need not worry as it is quite natural for the excessive semen to flow out.