Each person's body is different. I am not diabetic and my sugar level can be in the 70's and I am fine. My DH IS diabetic, and that same level would have him shaking and needing some carbs. So really 87 could be not low, if you're not diabetic, but low if you are.
Exercise also affects your sugar level; you didn't mention whether you were more active than usual, before the crash.
Ruth in Cookeville, TN Central Time Zone
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