Whenever I had females spayed, the vets never recommended putting anything on the area. It should heal fine-needs to stay pretty clean. Don't let her get in mud! It should be fine. I think if you put something on it, it would make her WANT to lick it, and tend to make stuff stick to it. If you don't get in the bed soon, it will be HER side of the bed.
Unless you are a "violent" sleeper, I would stick to the regular bedtime routine.