Cats are naturally playful creatures, and feet moving under blankets or sheets can trigger their hunting instincts. 

Kittens often attack feet as they go through the teething phase. Provide appropriate toys to redirect their biting.

Cats may attack feet out of boredom. Ensure your feline friend has enough toys and mental stimulation.

Some cats nip at feet to get their owner's attention. Spend quality time with your cat to reduce this behavior. 

Stressed or anxious cats may resort to foot attacks. Create a calm environment and consult a vet if needed. 

Cats can sometimes confuse feet for toys. Use feather wands and laser pointers for playtime. 

Train your cat to use appropriate outlets for their energy and aggression, such as scratching posts.