It's a part of every cat parent's life: You're sleeping deeply in the middle of the night when suddenly, you wake up to an earsplitting shriek. It's not a bad dream — it's just your cat.
So, why does your cat yowl at night? Some cats are chatty because it's a breed characteristic (The Russian blue likes to carry on constant conversations.) but most kitties do it for specific reasons. A cat yowling at night has something to say and wants to say it. Right now.

Why Does My Cat Yowl at Night?
Vocalization is just one of the ways in which cats communicate with their human families (and sometimes with each other). Much of cat language is nonverbal, making vocalizing an effective maneuver for getting someone's attention. It's possible to ignore (sort of) a cat pawing at your keyboard while you work, but a cat yowling at night? That will make you take notice.
Cats usually aren't too feisty when they go about their business during the day. You're awake and interacting with them, so there's no need for a screech. Cats are crepuscular creatures, however, meaning they are most active at dusk and dawn. Your kitty is programmed to kick into high gear right at the crack of dawn when it may still feel like the middle of the night. She may howl because she wants to eat (the hunting instinct runs deep in cats), or because she really wanted some extra-early playtime.