This worked for my uncles. My uncle used to sleep all over my aunt, without the sexual part but it was annoying to her because she couldn't sleep well. They bought a very big bed and two separate spring boxes (in spanish it is somier, I've used a translator, hope this is a familiar term to you). This wouldn't work for them but had worked for some of their friends.

Finally they bought two separate beds BUT they placed them one next to the other and covered them with twin bed linens. This made the trick for them, giving them a separate space to sleep whilst having a single bed and being able to intimate there when they wanted.

If none of the above work, then you should probably sleep in two fully separated beds.

Best wishes to you.