Both of my boys SW CAH,  at about 3 years old had hypoglycimic  episodes after being ill and not eating all night.  I woke them up in the AM, sweating and nearly unconscious.  I now, if my kids are sick,  fever or vomiting,  I wake them in the middle of the night and give fever reducer, cortef, and a sweet drink.  I have not had any problems since then. 

I have read, I think in the Australian CAH site,  that they give sugar or a sweet when a CAH child is ill/

 

Good luck