To know why that when we correct my son at night we need more insulin than if we increased the basal to covered that period the following night. For example, we noticed that for several nights my sons blood is about 6mmol at 10/11pm when we go to bed, but by 7/8am it has gone up to about 8mmol. We have done a few test to establish when he is going up and it would seem that from about 2-5am his blood goes up and then stays constant until 7/8 am. If I correct him about 3/4am I would typically give him about .2 of a unit so that by 7/8 am his blood is about 5/6 mmol. But, when we have gone to increase his basal to stop the increase in bg we find that he needs less than the .2 of a unit needed if we had given him a correction? I'm just curious and wondered whether there is some formular to work this out and why he would need less when we increase his basal than if we gave a correction.