lots of meowing when we're sleeping

Hi.  I'm new to using forums but I'm desperate for help with one of our cats who is meowing at night and early morning.  She used to do this at the house we lived in but since we moved to this apartment and in the last two weeks it's much worse.  I took her to the vet a few months ago and there was nothing wrong, I bought a whole bunch of new toys, tried all kinds (and I mean all kinds) of food and treats, we play with her and her sister almost all evening and during the day, but still, about an hour after we fall asleep she meows and meows and meows. My husband gets up to play with her, I sleep on the couch so she's doesn't feel lonely.  And then she repeats the same thing at 5 or 6 in the morning.  I'm almost in tears every day because I'm so tired and so at a loss as to what to do.

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