I know you are looking for a cure, aren't we all, but I have not found one yet. As background,I have had issues with bedwetting since I was in middle school. It is an occasional situation for me 1-2 times a month or less. Through the years, I am in my 40's I have tried the limiting fluids, bedwetting alarm in my underwear,and a host of other suggestions. None have got me total dry at night. I do realize that I tend to bedwet more when stressed or over tired.
I know these suggestions do not help, but hope they let you know that while bedwetting as an adult isn't common, it does happen. You are not alone.