What Cats Do At Night (Video) Posted on March 10, 2015 by Karen | Wonder what cats do at night while you’re asleep? As you probably guessed, they are quite busy, as this video illustrates. Watch as these kitties, play, talk and are just generally busy while their human rests. Written by Karen Karen is Publisher of Fully Feline. She also owns a pet care business in Overland Park, KS called Joy of Living.