It's perfectly normal dog behavior. The problem is you're not looking at it from the dog's point of view. Imagine you are your dog. You're sleeping soundly when, all of a sudden, this gigantic creature, much larger than you, leans over your head and practically smothers you. To dogs, this is not only a frightening gesture, but a dominant one, too. I also agree with crate training, but I also think that while crate training is a good idea, you need to understand why she acts like that. It could be fear biting because your husband (if leaning over) is performing a very dominant and distressing gesture. My Grey (thought to be one of the sweetest breeds) also growls whenever I lean over her. Tell your hubby to try not to lean over, and if he does, try to look for telltale signs of distress. She'll hold her ears back and crouch her head down and back away. For the time being, make her sleep in her own dog bed and continue NILIF (nothing in life is free).