I have severe obstructive sleep apnea -- am 6ft and 210. I wear a CPAP and now swear by it. A couple things to help those who try:
1) Make sure you have a CPAP machine with a water tank so the forced air is moist. For me, if the water runs out, that's when I wake up bc my nose dries.
2) Get a spray saline solution for your nose -- not Afrin or drugs (habit inducing) -- just simple and cheap Arm & Hammer Simply Saline.
3) Wear a shirt when you're in bed and put the hose under your shirt so it's hard to roll off.
4) Bonus -- sleep elevated.
Those are my best tips. If you can do the CPAP and suffer the awkwardness, you'll really feel so much better. First time it stuck, I woke up at 4:45 am fully rested and felt as if a heavy weight was lifted off me.
Best luck :)
As for point 3, I've found that the especially silly looking one that works so that the tube "points out of your forehead" eliminates that problem in an even better way.
Have you tried losing weight and if so, did that help?