Cats normally need to sleep for 16 hours a day, with 30% of that time spent in deep sleep and 70% spent easily startled, alternating between the two states. When cats are in deep sleep, they may show signs of dreaming, which can be seen from their external bodies, such as waving their paws, twitching their whiskers, or gently flapping their ears. 
Cats' favorite sleeping spots:
1. Sleeping under the owner's bed. The space under the owner's bed can provide shelter for the cat, and the cat can smell the owner's scent while sleeping, which will make the cat feel more at ease.
2. Sleeping on top of the refrigerator. Sleeping on top of the refrigerator means they won't be seen, and the height of the refrigerator allows for a clear view of their surroundings. If anything unusual happens, the cat can immediately run away.
3. Curling up to sleep. When cats sleep, they like to find a safe place to curl up into a ball. This sleeping position helps protect their soft belly.
4. Sleeping in a corner. Cats that lack a sense of security will actively seek out places where they can hide and sleep.
5. Sleeping next to its owner.
6. Sleeping while holding a toy. Some cats have a habit of sleeping while holding a toy, which indicates that the cat craves companionship.
