To be honest mine seem completely random all the time at the moment! sometimes itl be perfect before breakfast, take the insulin I normally would and sometimes itl be ok mid morning. Other times itl be 'sky high' and I cant understand why. I think the trouble with me some nights Il be doing heavy weight lifting and other nights I wont. This does have an effect over the next day, but I just cant seem to predict it at the moment - I will nail it eventually though!
BUT i know for a fact another thing that rocks the boat is stress! Even when I think Im not stressed, I usually am and it has a big impact on my insulin requirements. (I think some of the effects are due to eating more without realising it, being less active etc, down to the stress). Before I found these forums I was getting proper stressed over everything (I think almost to the point of being depressed about it all) but I think that happens from time to time.
The problem with it all is its a circle, you get stressed, eat more, or do less etc, it upsets your requirements and BG, you put weight on or get other problems arising from it, that stresses you out even more.....
ok il stop rambling now!