So, I had to take apart the bed yesterday, as we had a worry that down inside, underneath, there may have been a mouse that got in before we closed off the doors, and then died. The evidence was, unpleasantly, a lot of flies in the bedroom. No smell or anything, but flies.
So, taking that apart took some work:
making a mess, I decided to plaster in the bottom layer, to really cut off any possibility of this happening again