Like "This happens to me when my blood sugars are running on the higher side for a little while. Then if I start running at ideal or slightly lower numbers, I feel low when I'm not really. My endo explained it to me: basically your body has gotten used to running with the higher numbers for a period of time and when it finally starts running "normal" it can give you a false low feeling. After a few days of this, I start to feel fine when in the lower ranges. Unfortunately, I can also feel fine when I'm, in fact, running dangerously low (hypoglycemic unawareness). Not a good thing... My endo has me purposely run slightly higher than normal for about a week, then I am more sensitive to my lows for a while, until I get used to running low and then the cycle starts all over again!"