There may be a number of reasons why your cat might be pushing you while sleeping. Here are some possible explanations:

Comfortable position: Cats may find you a comfortable position, or they may like Sleep close to you. You may be pushing to find a more comfortable position or position.

Attention-seeking: Cats may want your attention or interaction with you. They may push you to get your attention, hoping you will play with them or give them some attention.

Instinctive behaviors: Cats sometimes engage in instinctive behaviors while sleeping, such as stretching, twiddling their paws, or shifting positions. Pushing you may just be an unconscious action on their part.