A load of bloody junk!! From what I can remember the last time we turned the mattress over and were startled at the crap we could see through the slats there was;
Christmas wrapping paper that hasn't seen the light of day for a couple of years, a collapsible BBQ (!) silk painting kits, odd socks that have been kicked under and lost forever and lots and lots of dust!!!
Reckon tomorrow could be the day to sort it out now you've reminded me about it!
Nothing I have an two bed drawers full of clean bedding, Plus it is an electric bed (good vibrations) so I guess the motor is under there too somewhere.