CGM-Too Many Bugs?

I have been having lots of highs in the morning, and my endo suggests it could be as a result of lows at night.
So I asked if that might make me a good candidate for CGM (continuous glucose monitoring). She made a bit of a face, and said the technology was still weak. (??)
Apparently, at a recent conference, some docs wore the CGM at night and were getting alarms, but they weren't even diabetic.
So they have doubts about the efficacy.
My questions are:
1. Did they then pull out a meter and check if the numbers the CGM was getting were right?
and
2. Doesn't every one's blood sugar fluctuate? Yes. Couldn't a non-diabetic's blood sugar be dropping during the night and causing the alarm to go off? I would think so.How could the monitor tell you weren't really diabetic? If your sugar is dropping and you're wearing a monitor, presumably you inject insulin and that kind of drop (which is natural in a non-diabetic) could be a threat (and usually is) to a diabetic person. Thus the alarm. Sure, if you aren't diabetic, any alarm at all would seem stupid.
But if you were dropping, on insulin, wouldn't you like to know?