We've had the same issue for 20+ yrs. It's not insurmountable. My man works nights. I'm up in the day to do daytime business, like collecting packages, making phone calls, and running certain errands. This causes a problem bc its harder for me to switch back to his schedule. Me being awake rn is a sign of this mismatch.
If you don't think she/ the relationship is long term worthy, live apart. But if you intend to keep her around, don't do this. Even if she says it's cool, subconsciously, she halfway single.
Re: missing the single version of you. Astrology would be helpful here bc what you're describing is the difference between two different types of relationship charts, but since men generally arent interested in astrology, you've lost access to one potential source of guidance.