Ooh...I'm going to have to try this. What I have been doing is playing a game I call "sheets". I sleep with a fan on, and I pile the blankets and comforter down at the end of the bed. Then I turn the fan on, and it makes a sheet bubble. Hanna the kitten especially like it, and the way the fan moves the sheets makes her think that something is alive on the other side. She likes to attack from both the inside of the bubble, and the outside. Fun, fun, fun!