I decided to test at that time out of curiosity more than anything - I wondered what my sugars were doing during that time! I dont think it is down to overcarbing - my shots are quite modest and, going on the reading I get before bed, on target for how much I am eating. My pre-evening meal readings are usually a bit elevated - around the 10 mark.
If the insulin has not had time to work within 30-60 mins after eating, I am guessing the food will have? Working on the idea that, when treating hypo's, food starts working to raise the sugars within 10 minutes. I think I might give Dave's idea of doing the insulin 15 mins before the meal a try - I want to see my readings never get above 10!