I'm Dr. Jo and I'll do my best to help you with your questions about Millie.
I'm so sorry she's got you worried, but glad you are looking for the information you need.
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This unusual behavior that you're describing that happens only at night could be the result of a few different things.
The first important distinction to make is to ask, "Is this a behavior problem or is this a medical problem?"
Even though she is acting fine during the day, it's still possible these changes are the result of some underlying medical issue.
To pursue that, I'd advise a thorough physical examination, including basic blood tests and a urinalysis.
Sometimes the earliest symptoms of many different medical problems can show up like this.
And the earlier you get a diagnosis, the more likely you will have successful treatment.
So that's the first thing I recommend: a thorough physical examination to rule in or out any medical problems causing this.
If all potential medical problems are ruled out, then you know you are dealing with a behavioral issue.
Your intuition may very likely be leading you in the correct direction here.