Per my 6:15am update: Chalk one up to my own paranoia -- my wife took our son to her room because she forgot it was my night. Even though I have to say that it's really hard to forget especially if you had our dog in your room too (we alternate between watching our son and the dog).
Anyway, I told my wife that I appreciate her being so flexible. She said, "Of course I can flexible." I said, "Well, if you'd prefer, on my nights, you could always knock on my door and wake me up if you hear "E" crying."