The moment in the post above — Those zzz’s won’t catch themselves — is one of those small everyday scenes that says a lot about life with cats.
Even the most pampered indoor cat is, at heart, a small ambush predator. Hunting behavior is so deeply wired in that cats who have never set foot outside will still stalk shadows, chirp at birds through windows, and pounce on dust motes drifting across the floor. The cat in the post above is running a tiny, harmless version of an instinct that kept cats alive for thousands of years.
Studies of free-ranging cats show that they take dozens of small prey each year on average, and most of that hunting is not driven by hunger. Cats hunt because the act itself is rewarding to them. That is why owners are sometimes “gifted” a sock, a toy mouse, or — less happily — the real thing.
Channeling that drive into wand toys, food puzzles, and games of chase is one of the kindest things an indoor-cat owner can do. A daily hunt, even a fake one, makes for a calmer cat at night.
Source: www.reddit.com

