There may be several reasons why cats meow at night. Cats are nocturnal and are more active at night, so they may make sounds to indicate their presence or to find a mate. Cats may feel lonely or anxious and may vocalize to seek attention or companionship. The cat may be looking for food or water and may make noises to attract its owner's attention.
The cat may be making noises due to pain or discomfort. In this case, the cat should be taken to the doctor immediately. If your cat's meowing behavior becomes a problem, you can try to observe the cat's behavior to find out the cause of the meowing and take appropriate countermeasures. For example, if your cat is meowing because he feels lonely, consider giving him more companionship or toys.
