Don't move the bed?  If you don't move the bed maybe the cat will stop
getting behind there?

Per empressofanime@sbcglobal.net:

We lock ours out of the bedrooms.   Carries too much crud in from the outside.
Another reason for having an "indoor" cat, I guess.

As far as moving the bed goes, when ours manages to get under there in spite of
our efforts, a little gentle prodding with broomstick gets it out.   You
probably don't even have to touch the cat with the broomstick - just having it
probe around under there seems to do the trick.