First, read the English article below.

Cats are big sleepers. In fact, they sleep on average 16 hours a day. However, if your cat seems to be sleeping more than usual this might be a sign of depression.  As cats sleep so often, it can be hard to gauge how much is too much. However, you should have some idea of when your cat tends to be awake and when she tends to be asleep. Use this as a guide when monitoring her sleeping habits.  If you know your cat is always awake to greet you in the morning and suddenly she spends that time snoozing in the pantry, this could be a sign she's depressed. If she's always awake after work and now you find her asleep on the couch, take note of this as well.  Watch for general dips in energy. When your cat isn't sleeping, does she seem lethargic? Some cats are naturally lazy, but if your once bouncy and energetic cat suddenly lies in bed all day this could be a sign of depression. Cats make a range of sounds, from hissing to purring to mewing. If you notice your cat seems to be vocalizing more often than usual, this could be related to depression.  Depressed cats might cry, yowl, or hiss in response to mild stimuli or simply vocalize at random points throughout the day. She may be trying to communicate something is wrong.  Much like sleeping, how much is unusual varies from cat to cat and you're the best judge of what's normal for your pet. If your cat is normally loud, mewing to announce her presence or ask for attention, you may not need to worry about frequent vocalization. However, if a normally quiet cat suddenly starts keeping you up at night crying she might be trying to communicate unhappiness. Excessive vocalization frequently results from the death of a close companion, which can either be a pet or a person. Your cat might cry to try and help a missing companion locate her. Depressed cats might over or under eat in response to sadness. Take stock of how much your cat is eating.  Loss of appetite is a major factor in depression in both people and animals. Your cat may be disinterested in food and you might... 

Now, please write a short abstract for it in Vietnamese. Abstract:
Quan sát thói quen ngủ của mèo. Lắng nghe tiếng kêu của mèo với tần suất cao. Quan sát thói quen ăn uống của mèo. Kiểm tra lông mèo. Lưu ý tần suất ẩn nấp của mèo. Quan sát khay vệ sinh.