How to prevent nightfalls in men ?

THIS ONE IS TRICKY: Elderly men or women are at risk for nightime falls. They need to get out of bed to go to the bathroom, so putting up barriers between them and the floor can actually increase the risks for injury. There is absolutely no safe, definite strategies other than trying to train them to call/ring abell/baby monitor their rooms and help them get out, and get back in bed safely.

Nocturnal emissions: I suspect our correspondent is asking about ejaculating semen while he is asleep. Some cultures call this "nightfall". Although it's natural and healthy, and happens to all young men who do not ejaculate frequently with a partner or by themselves, some folks warn about health dangers for superstitious or darker reasons. Dad might be a good guy to talk to.