In one sentence, describe what the following article is about:

Cats are known for their love of routine. By having a routine that ends with you sleeping, your cat will eventually be able to understand the signs of bedtime. Be sure to do the same activities in the same order every night; brush your teeth, change your clothes, make the bed, and turn off the lights. Even if your cat isn't watching you, sounds of your bedtime routine will travel throughout the home. Set aside certain fun activities that your cat enjoys that only happen before bedtime. You can:  Groom your cat. Cuddle in bed. Brush your cat's teeth. Feed special treats. Lead your cat to their sleeping area. The first few days or weeks may be difficult for both you and your cat, especially if you have a restless or aggressive cat. Your cat might come up to you for pets or whine at you for hours. And then you may be tempted to get up and tend to your cat. By doing this, you are giving it the attention that encourages unwanted behaviour from your cat, even if you're giving it positive attention. By ignoring your cat night after night, you are telling your cat that no matter what they do, nothing will happen. Their unwanted behaviour should eventually stop.  Avoid getting up to get a drink of water or to use the washroom. Plan ahead as much as possible until your cat establishes the routine of going to sleep. Consider leaving your cat outside of the bedroom. In some cases, your cat may be too difficult to ignore while they are in the room. Do not give in and open the door for it or talk to it from inside the room. Establishing a bedtime routine with your cat may take a few weeks and you may need to make a few sacrifices. With any behavioural training, time and patience is always the key. Even though you are trying to change your cat, you will also have to change. Sometimes pet training is more about compromise than about the success of learning a new behaviour. Remember, your cat is also a living thing with feelings, thoughts, preferences, and a unique personality.
Establish a consistent bedtime routine. Involve your cat in your bedtime routine. Ignore your cat when you are sleeping. Don't get frustrated. Finished.