Just read Freddo's post. @BluesBrother is right that is a very good way to approach it.
I would stress along the lines of Freddo's advice, go slow and always ask questions of your wife as you subtly try to wake her.
Don't push or say "see this is what I found". She'll see you're visible concerned about things. When she asks. Say things like, "I'm really concerned about x. Is my thinking out of line? Because this is what I'm finding? How can this be?
Always in a question form like you're trying to resolve the issue in the way she would expect. It quietly puts the onus on her to answer the question.