Why do cats crawl under blankets?

Above: My cat under the covers larking around. Photo: Michael.
Domestic cats crawl under blankets to:
- Feel secure;
- Feel physically warm;
- Feel emotionally warm and reassured as it is likely that the cat will smell the scent of their human companion;
- To have some fun.
A concern is that cats cannot breathe properly under a blanket or a duvet cover. A domestic cat will know when it is time to vacate the den under the blanket. There is no problem with a cat breathing properly. If the cat finds it uncomfortable under there for whatever reason they will vacate the place.
You have to be careful that you don’t fall asleep with your cat under the duvet with you. You don’t want to cause an accident to happen with you rolling over onto your cat. Your cat will escape but it wouldn’t be particularly pleasant.
It’s a personal trait whether a domestic cat likes to go under a blanket or the bedsheets with or without their human companion. Sometimes cats like to play under sheets or blankets because it’s fun. They can nose around and it appeals to their inquisitive nature.
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