I'd recommend a white noise machine, but your CPAP machine is probably just as good.
What's your caffeine intake like? If you drink coffee, tea or soda, do you just drink it in the AM or do you drink it all day?
Any new aches or pains? That could wake you up, too.
I hope you get it figured out soon! It's rotten to get up that early and still be tired.
dx: SLE 07/2011, OCD 2006, osteoarthritis 2002
rx: plaquenil 200mg/day, methotrexate 10 mg/week, NSAID for pain, zoloft 200 mg, folic acid