I found a scratch on the back of my shoulder. 
I don't know how it got there. 
Yes, I pick up my cats and yes they have their claws. 
But I wear clothes when I pick up my cats. Plus
Being winter I wear 3 layers of clothes in my house.
67 degrees is only comfortable outside without 3 layers of clothes.
I wear a loose T-shirt for sleepwear. 
Highly probable I scratch myself in my sleep.

This concludes today's unexpected poetic revelation.