Mind Switched Pets?

Bob says he think I might be part right about the aliens, only they have not replaced him and Monika, they are trying to reverse their personalities.  Usually, on a day off, Bob likes to sleep in late and Monika gets up early to get on the computer.  This morning Bob rolled over and was awake at 6 am and it is 6:40 now and Monika is still sleeping and shows no sign of waking up.