I also test every morning after fasting during the night. I have also noticed if I take blood sugar after I walk on the treadmill it spikes up. My one son does diabetic counseling says that if you eat a large meal at night overloading the stomach distends the colon causing a release of insulin larger than normal 4 to 5 hrs later. If no food has been eaten then that will also raise blood sugars in the morning. After a large meal he suggest 4 hrs later eat a small snack.
