When you cat is being unusually vocal, you need to be sure that first of all, the cat is healthy.
Sometimes,we create the behavior for a needy cat, by reinforcing their noise with pleasureable things. For example, the cat cries, the owner drops what she is doing, runs to the kitty, pets the cat, feeds the cat, plays with the cats...then leaves. The cat eats, bats the toy around, gets bored, starts to meow- the owner appears, the cycle is repeated...... You now have a cat that is alpha over you-
For nocturnal cryers, understand that this is normal. Cat's hunt at night, and they call to each other at night. Your cat is calling to you as is her instinct, so right before you go to bed, you play with this cat for about 15 minutes with an interactive toy like Da Bird. You start out slow, then build into a fever pitch then slack off the energy level. At the end, you leave your cat without the toy (prey) but you give her a nice bowl of canned food. She will then start sleeping through the night-
If you know your cat is healthy than when she cries, you ignore her. The minute she is silent, you go to her and pet her, or play with her, but the minute she cries. You leave. You keep this up and you are reconditioning her to understand that you are Alpha and she is not calling the shots. Also feeding a cat every time she cries is dangerous and can lead to obesity, heart problems, diabetes, or just a finicky eater- none of which you want.