As I'm typing this, Melly is out cold and belly-up at the foot of my bed. At odd intervals, she is squirming, kicking, and violently thrashing her tail. I'm no expert on the subject, but I've never seen a cat as active in her sleep as Melly; she routinely engages in what appears to be a sort of somnolent feline karate. I wish I could provide video, but getting up to retrieve my phone or camera would disturb our fuzzy little martial artist.
Do your cats do this? What do you suppose they dream about?