In reply to Iwan:
You lost your sleeping bag in the loft? Just shift a few more boxes, and you'll find it again.
Get the cat to help you, as she'll home in on the insulation for warmth.
As a vet, I have to tell you not to put your cat in the tumble dryer, nor the washing machine, nor yet the microwave (though apocryphally that's more often toy Poodles).