Hubby likes dark to sleep, I like windows and fresh air.
The shades that came with our RV were not dark enough for him. We didn't want to replace the shades, so as a compromise, I made covers that fit over the top of the valance.
I couldn't match the fabrics used in our quilt - too old, but I was able to match the color families and used a complementary design. They are interlined with blackout fabric. They work like a charm. He has the dark he wants to sleep on his side, and I can have fresh air. If we are parked so that the sun comes up in my eyes, I can pop my cover on. Cost - about $20 for the pair.