Had you asked me yesterday morning, I would have sworn that the cat was in cahoots with the baby. Several times during the night it woke us up with bizarre yowling. The first time, after a few minutes, I poked my head outside to see if something was wrong, only to be greeted with the usual "Murrrow?" We did our best to ignore subsequent noises, not wanting to encourage the behavior, but still was fleeting.
As it turns out, the cat was just ravenously hungry. She completely blocked the other cat from the food dish after I filled it, and even went back for seconds. I think she might have had a little cold, as she seemed to have gone off her feed the last few days, which had me rather worried (this is the cat that had to be force-fed and racked up several hundred in vet bills last year).
Monday morning's feast also meant that Tuesday night we didn't have a starving cat, and so were able to get a night of uninterrupted sleep. Seeing as we only have 6 more months until regular sleep disturbances, we're doing our best to sleep well while we can.