Ownership! When your cat rubs up against you it sure does feel like a sign of affection. But what is the the real motivation? Your cat is actually rubbing his scent on you, claiming you as his property!
Communication! Cat's have developed over 100 sounds. They do not meow at other cats, instead, they use these sounds to talk to you. The more you talk to your cat, the more your cat will chat back with you.
Well, it depends on their age. Kittens sleep because they HAVE to. Kittens release a growth hormone only when sleeping, so they need to sleep in order to grow. Adult cats? They just sleep because the CAN! Who wouldn't want to sleep 16 hours a day!
Your cat doesn't really think of itself as a tiny human, it thinks of you as a really big cat! When your cat brings home a gift after a hunt, it's trying to either provide food for you or trying to teach you how to hunt for yourself. Now, isn't that sweet?
Warning! Cat's don't really want to get into a physical confrontation, so they try to scare off their enemies by mimicing a snake. Cat's reveal their fangs and make sounds similar to snakes. Even Indiana Jones would take pause at that.