There are a few different reasons why a cat may get in their owner’s face when they are sleeping. Some possible explanations include:

1. Affection: Cats are known to be affectionate creatures, and getting in their owner’s face when they are sleeping may be a way for the cat to show affection and bond with their owner.
2. Attention seeking: Cats may get in their owner’s face when they are sleeping as a way to get attention. This can be especially true if the cat is not getting enough attention or if they are feeling neglected.
3. Hunting instincts: Cats are natural hunters, and getting in their owner’s face when they are sleeping may be a way for the cat to play out their hunting instincts.
4. Territorial behavior: Cats are territorial creatures, and getting in their owner’s face when they are sleeping may be a way for the cat to mark their territory and assert dominance.
5. Comfort: Some cats may get in their owner’s face when they are sleeping as a way to feel comfortable and secure.

In summary, there are a variety of reasons why a cat may get in their owner’s face when they are sleeping. It could be a way to show affection, seek attention, play out hunting instincts, assert territorial behavior, or seek comfort. Understanding the specific behavior and needs of an individual cat can help their owner better understand why their cat may engage in this behavior.