My veterinarian is hitting the books and checking with other veterinarians. She is leaning toward narcolepsy, except this only hits Ivan when he's already asleep. He doesn't have any episodes when he's walking around or just watching the world.
Please forgive me for yelling at him and shaking him so. I did it so the veterinarian could see what he does and does not respond to. Normally I just leave him be. Lately I've discovered a sharp whistle often wakes him up.
He went in for an exam yesterday and more blood tests. It was time for that to happen anyway. He has been shaking his ears and I wanted to have them checked. The vet says they are clean as a whistle, so something else is going on. Other than that, he's a content 16 year old cat. She says other than his oddities, he's in great shape. He's happy at home, has a good appetite, smacks the other cats when he's had enough of them, cuddles up with them when he wants to, and treats me like a goddess.
You don't need to watch the whole thing, but do advance it to the end, to watch him wake up and walk away like nothing happened.
Brain tumor? Who knows. As long as he's comfortable, I want him with me.