My cat, Munchkin, was a ball of fire as a kitten. She was super playful, hyperactive, played fetch for hours, chased the other kittens until they’d had enough and then chased them some more. She was a lot of fun but it was clear that something wasn’t normal. She was jittery, looking in all directions at once, the slightest noise would make her jump up from a deep sleep. She never seemed to fully relax and was always meowing about something or nothing. Since she was so small it was nothing but fun and games and we didn’t question it, we thought it was just kittenly behaviour that would subside with time.