Bed wetting in adults must never be taken lightly.  

Some bed wetting (and no-one knows just how frequent this is)  may be the result of the genetic pattern of Primary Nocturnal Enuresis which is diagnosied when: the sufferer has never been consistently dry at night; there is evidence of a family history of bedwetting (although this may be hard to find out) and;  all medical examinations are negative.  This is best treated using a bed wetting alarm, and may benefit from the addition of bed wetting medication

 Bed Wetting and Sleep Apnea. 

If an adult suffers from bedwetting one of the investigations should be for the presence of sleep apnea.  The periods of apnea can sometimes result in bed wetting and for this reason bed wetting can be diagnostic for sleep apnea. 

The bottom line is that sleep apnea is a signficant hazard to the health of the sufferer and must be treated without delay.