Being stressed out is one of the causes of bed wetting in kids, teens and adults.
Along with other causes such as weak bladder, Urinary tract infections, bladder infections.
A child that wets the bed could have something serious going on that should be checked by the child's doctor.
But most times a child wets the bed due to stress or the bladder not growing fast enough along with the rest of the child's body or bed wetting could happen because the child is such a sound sleeper and the bladder being full doesn't wake the child up.