Wellll, I think I'm likely to face a similar situation to you bed wise over Christmas. FWIW, I'm fully expecting to return to the spare bed. I wouldn't like to make an assumption or take advantage of a situation bourne out of necessity. My W and I are way from making this sort of move and so my expectations in this department are way down low. I guess your tack should be informed by looking at the tenor of your overall situation at the moment.
Best GFI
Me: 40ish W: 40ish Together: 20 ish years Married: 10ish Years