Mine has a different obsession...kI don't know how he does it, but every time I need to change the bed linen I stealthily creep up the stairs, even avoiding the ones that creak,and strip the bed. That's fine. I even get the pillows in cases and the sheet down. But every single time I get to the out the duvet in the cover job, he launches himself out of nowhere like a Ninja, and attacks the duvet, the cover,and rolls about, biting the cover before curling himself up,.with the happiest of puree and sleeping for 10 hours straight.
Every time!