First, you need to know why the cat is meowing at night. Some cats get hungry at night, and that's when they meow. Cat owners can give the cat some cat food, and once the cat is full, it will stop meowing.
If the cat isn't hungry, it might be in heat. Cats in heat often howl at night and may rub against their owners. Some playful cats might even run outside. Therefore, cat owners should make sure to keep doors and windows closed. You can prepare treats and toys to distract the cat. It's recommended to place treats in various corners of the house so the cat can find them, which will help burn off some energy. However, treats will eventually run out, and the cat might continue to howl afterward. In this case, it's advisable to provide the cat with calming products. 
If the cat owner doesn't intend for their cat to breed, it's recommended to have them spayed/neutered. This will improve the cat's health and prevent them from going into heat again, which is better for them. It's advisable to choose a reputable veterinary clinic and have a qualified veterinarian perform the procedure. After the spaying/neutering surgery, the owner should immediately put an Elizabethan collar on the cat to prevent them from licking their wound and take good care of them.