Would test thyroid - if severely hypo, it may be the cause. weight loss, cpap, mouthpieces and surgery are the usual treatment options.
I don't know alot about Sleep Apnea, but I know it is not fun. I do know this, that when you don't get your rest, your body can't heal and regenrate. Something he could try that is not a RX is magnesium at night and 5-HTP. They help relax and re-set the seritonin levles. Do a research on. Sorry I can't help much with the Sleep Apnea.
graywings