I can feel it when my blood sugar levels are dropping quickly even if they have not reached hypoglycemic levels, and I have heard other
diabetic people say the same thing. If your
glucose levels rise above the norm a lot
during the day, your brain is reacting by asking your pancreas to secrete more insulin in order to lower those levels. When this happens, your glucose then drops either back to normal, or in some people, a little lower than normal.