Hi Dee, how much does your son drink through the day. As that can cause problems. I am a adult SWCAH  and depending on the day i have to get up and go through the night. It does have to do with CAH. Also it does depend on what is drunk especially if caffeine drinks as the kidneys are trying to filter out and that can cause excess need to go to the toilet. The main thing is to reduce liquid intake after dinner so the kidneys aren’t filtering as much during sleep. Also don’t overdo electrolyte drinks as it only feeds the kidneys and increases the bodies electrolytes and renin results.

Goodluck with your son

Stay healthy, Stay strong

jayne