Please please kick their arses and make them go to the doctors and checked out for sleep apnoea. It is really quite a serious condition, and can have vast long term effects including weight gain, cardiac disease, hypertension and some research is starting to show that if there is a tendency to any disorders i.e.: diabetes, it can bring it's onset on earlier. It becomes a vicious circle, weight gain because of tiredness, lack of excerise, more weight gain etc.
there is also some thought that Sleep Apnoea is responsible for a large % of 'unexplained' RTA's too.
The solution doesn't have to be surgery; and sometimes if the palate is floppy, weight loss alone won't help. OH has Sleep Apnoea, even though he is very sporty, well within normal BMI, doesn't drink often maybe a glass of wine a week, his is due to a structural defect in his palate . He has CPAP, a machine that forces/ pushes air in to his airway. The mask can take a bit of getting used to according to OH but the benefits again according to him is huge. At the start he could only tolerate it for about 2-3 hours a night but within a week he could feel the difference in himself and worked at it. If he's been away and not used it I can see it in his face and manner straight away.
From my point of view it's nice been able to sit down and watch TV/ go to the cinema etc. with him, without him falling asleep within 5 minutes, previously he wouldn't sit down because he knew he'd fall asleep. If we were around friends for dinner and the rest of us were sitting have a drink afterward putting the world to rights he'd be stood up, afraid to sit/relax in case he fell asleep. Restricted who he was happy to go to dinner with as he didn't want to be seen as rude. Though it does mean that he's on ebay a lot more.
The machine sounds a bit like a wave machine or a white noise thing, very soothing, and so much better than snoring.