I've read this group long enough to have seen many posts about
senility.  I'm beginning to wonder if that's what I'm facing here.  
Kami has taken to yowling almost non-stop.  I've investigated
everything she ordinarily is calling to mt attention when she does
that, like food, water, litter box, too much attention, not enough
attention, I don't feel well, I messed me bum get the wipes, lights on
please, lights off please... you name it.  After all of that last
night, there still wasn't ANYTHING wrong.  I thought she wanted seconds
for dinner, but when I went to her bowl, she hadn't eaten her dinner.  
Doesn't feel well.  Right?  No, I pointed it out and she acted as if
she hadn't seen it and started eating.  Of course she saw it--she
demanded it the instant I got home.  

She's also coming into the room and yowling at night.  That's where I'm
going to have to draw the line.  If this is a new habit, I'm going to
have to shut her out and she's never been permanently shut out in her
16+ years (though for a night once in a while she gets ejected when I
absolutely must sleep).  I emailed her vet, who is very conscientious
about bringing pets in when there's trouble, but she wrote back that
she didn't see the need for an office visit and maybe it's just a short
duration "phase."

Argh!