Yes, I think the sleep apnea is a result of radiation. His radiation was aimed at his throat since the cancer was on his vocal cord. I have found a list of exerices to do that might help. (As if he doesn't have enough to do with swallowing exercises, neck stretches, lymphadema therapy, and speech therapy!!!) Right now he is napping on the couch and it is so sad to see him not breathing and so restless, definitely not quality sleep that can't be good for his immune system to be so run down. Thankfully everything else is going really well being 3 1/2 months out of treatment.