Cats meow at night for several common reasons, including natural nocturnal behavior, boredom, hunger, anxiety, and medical issues. Cats are crepuscular animals, meaning they are naturally more active at dawn and dusk, leading some to be vocal at night. Indoor cats may also meow because they feel lonely, bored, or have excess energy at night. Older cats may meow due to aging or health problems like hyperthyroidism. Sometimes, unspayed or unneutered cats meow loudly as part of mating behavior. Addressing these causes with increased play, feeding before bedtime, providing attention, or a vet check can help reduce nighttime meowing.