Arnold Tickles Himself

So Arnold was taking a nap today on the 3-people couch all rolled up in a little ball with his tail over his eyes.

All of a sudden his head jerks up and, eyes closed, shook his head and licked his paw and groomed his face.

Then he tucked his face back under his tail and fell asleep again.

I think he tickled himself with his tail while he was sleeping.