I have the problem too and have not been diagnosed with CFRD. I've been told I'm borderline for years; I do an annual Glucose Tolerance Test (GTT), which always comes back normal. Lately, I've been waking up with low blood sugars and it's usually when I've eaten a carb rich meal or snack right before going to sleep. My understanding is similar to Ender's: the pancreas sort of forgets to release the insulin you need to break down sugars right when you eat them and then it suddenly remembers, shoots out some insulin, and causes you to have a low.
To treat low blood sugar, I take 15 grams of fast acting carb. Glucose tablets are ideal and can be found in any drug store, but other things that work are candy (but not chocolate), soda, juice, etc. The urge is to keep eating these things until you feel better, but that could cause your sugars to spike. So you want to start with 15 grams, wait 5 minutes, do 15 more grams if you're still not balanced, and so on. At least, this is how I was instructed by my dietitian <img src="i/expressions/face-icon-small-tongue.gif" border="0">
To treat low blood sugar, I take 15 grams of fast acting carb. Glucose tablets are ideal and can be found in any drug store, but other things that work are candy (but not chocolate), soda, juice, etc. The urge is to keep eating these things until you feel better, but that could cause your sugars to spike. So you want to start with 15 grams, wait 5 minutes, do 15 more grams if you're still not balanced, and so on. At least, this is how I was instructed by my dietitian <img src="i/expressions/face-icon-small-tongue.gif" border="0">