A. If your kitty is an older cat, then there is a possibility that he is getting senile. He feels lonely and scared at night and does not realize where he is. You can try leaving a night light on and/or a radio. If that does not make a difference ask your vet about a medication called Selegiline, which helps dramatically with senility in cats and dogs. Depending on where you live this may be off-license. Your vet will do an exam to rule out other causes of excess vocalisation, such has hyperthyroidism.
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