It's possible that this is:
* A brand name that is very niche or local: You might have seen this name in a specific region or context.
* A fictional name: Perhaps it's part of a story, game, or other creative work.
* A misunderstanding: You might be thinking of a different product or service with a similar name.
If you can provide more context about where you encountered "Royal Cat Nap," I might be able to help you find out more information.