When young puppies twitch in their sleep this is called Activated Sleep.

 

During this Activated Sleep they’re not dreaming of chasing bunnies or playing ball, they’re body building! As puppies of this age spend so much time sleeping they would never be able to build enough muscle to stand and walk, for this reason the puppies twitch and pop as a form of exercise.

 

The puppies twitch and pop due to their brains sending out small electrical impulses to stimulate and build their muscles. Activated sleep is a key indicator that the puppies are healthy and developing well.