Hi M.,
Just read your post and had to write you. My daughter wet the bed every night until she was 5. At that time, I took her to a urologist, because she had a bad bladder infection. It had backed up, almost to her kidneys and the doctor said it would have really messed her up it we hadn't caught it. Then I explained to him about her wetting the bed every night. Now listen to this.....
The doctor told me that he was giving her some nose spray called "DDAVP" nose spray. We would spray her nose, every night before bed, and she never wet the bed again....unless we forgot to spray her nose.
The reason it worked is....DDAVP is a hormone that our brain sends to our kidneys from the pituitary gland telling our kidneys not to produce urine....because we are asleep. In Christie and maybe your boys case, the pituitary gland wasn't sending the signal to shut down the urine production at night....so she and maybe your boys, would wet the bed.
When Christie was 11, and the age may be a little older in boys, she went through puberty and that meant that the pituitary gland was working and telling her body to change, so the doctor took her off of the nose spay.
She never wet the bed again!!!!
Talk to your son's doctor and if he won't help you, go see a urologist.
Hope this helps you.
K. a.