One eye open
Cats could sneak up at any time. So could a predator. And so could sneaky hooman hands. My advice is - always keep one eye slightly open, even when napping. Or at least be ready for what might be coming. I'm not one for getting my claws out, but you never know... If it's my hooman, I prefer to sniff him, headbutt him, or let out a 'mrrrp'. But it pays to be on your guard. Catty caution is essential.