Heredity
Not many people are aware, but heredity is a major cause of bedwetting in adults. If you have parents, both of whom were bedwetters, you have 77% chances of inheriting the problem. With one bedwetting parent your likelihood of inheriting the habit reduces to 40%. The genetic predisposition in these people is such that, they can never wake up from sleep when they need to urinate. Mostly, these are the people who never had dry span in their lives.