Dog Bed and Breakfast?

Lately, Mia has taken to sleeping in the larger dogs' bowls. She gets plenty of food (as you can see from her pudgy belly!), and she has a wonderfully soft dog bed of her own, so we're really not sure why she's doing this.
Jay comes running to "tell mommy" whenever Mia's in his bowl, so it's obviously not something that the Boxers find amusing.
Does anyone else have a little dog who has this habit?