Oh yes, we do that too. We both have a 2x2 m duvet. He comes on my side and gets warm( he is the one with cold feet and hands in the family) and gets sleepy while I play with his hair, and then slides under his cover to sleep. I like to „cocoon“ myself sometimes and I also sleep like a frog with my legs flexed. And if one of us snores too badly or has a cold, one of us sleeps on the sofa in the living room, which I built especially because I wanted to use a mattress there, so it is comfy for sleeping.

We did find once in France a big bad with a very big duvet on top, we could sleep comfortably under that single one without touching even if we wanted.

A good night sleep is essential for the happiness of the marriage and the rest of life. There is no shame in making it work for you. I heard some say 2 sinks are essential, but in our case I think 2 toilets would be great.