I am sure that there isn't a guy on earth that snores as loudly as my son and he can even start snoring if when he dozes off in a chair it could be anywhere at anytime. It seems to be loudest if he is led flat on his back or if his head is tilted right back sat in a chair. He is overweight too so that is probably contributing to his snoring. What I am going to suggest to him is not eat meals that are so large or eat them too late in the evening and encourage him to sleep on his front rather than his back.

My ex-mother in-law had an old wives tale about sewing a cotton reel to the back of a pair of pajamas which would make it so uncomfortable it would force the snorer not to sleep on his/her back. Don't know if this method works but if it saves having medication or surgery it is worth a try hey?