I've been checking my BG recently and found my fasting readings slightly higher, too. I don't know if this applies but I found it to be interesting.
Originally Posted by mobettabody
3. Dawn Phenomenon. If your blood sugar is highest first thing in the morning, and normalizes after you eat or exercise and stays normal hours after dinner, you may have a disturbance of regulatory hormones that is called "dawn phenomenon."
Our bodies prepare for waking up by secreting stimulating hormones shortly before dawn. These increase our insulin resistance in order to raise blood sugar a small amount. If we were animals who had to go hunt for our first meal, that excess glucose would be useful. Since were are people with refrigerators, it is less so.
Retirement has afforded me the ultimate affluence, that of free time (Sahlins/Wells)