I agree with Traveling Lady, sleeping position can make a big difference. I believe it's sleeping on your back that tends to be the very worst position for good breathing in your sleep, and there is an old wives tale type solution in which they used to sew a walnut into the backs of each of their husband's pajama tops to keep them rolling back over on their backs and snoring ... (seems so cruel.. mightn't a hazelnut have done the trick? )

A more humane way that works for me, for keeping myself sleeping on my side is just by putting a pillow between my legs -- which is good for your knees too -- it seems to keep me from rolling on my back for the most part. If you do this, you might want to switch off between sides, but between the two the most restful sleep is said to be to your left, because of the way your stomach and esophagus are lined up, it's gentler on that system. Since you're trying to get the best sleep possible for now, I thought it worth mentioning.

Another thing you could also consider adjusting for right now, depending what the weather's like right now where you are, is climate control. Like, if it's dry in your house and you have a humidifier around you might want to run it at night, to circumvent getting a dry throat.

That's great you're going to do the sleep study -- it's the only way to find out what's really going on, during those 8 hours we're unconscious. Good luck!