I think everyone is different when it comes to this. But there is a ball park number so to speak.
So for you diabetics and prediabetics what is a good morning number and a good bedtime number?
Do you think some people can just have a "higher" number? Kind of like blood pressure? Or should everyone be the same?

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"What lies behind us and what lies before us are tiny matters compared to what lies within us"
---Ralph Waldo Emerson---