Melissa,
No, I've never used a CPAP.
The reason I know aerobic exercise helped me is because when I wake up,
1. I'm well rested.
2. My mind is clear.
3. I have no trouble concentrating.
4. I'm full of energy.
(In other words, bright-eyed and bushy-tailed 😀)
Other things I do are
1. Start off sleeping on my side.
2. Wear loose light clothing in bed so that the chest and abdomen can expand and contract freely.