Im going to take an educated guess at whats happening with you as I used to be a Lantus user! Lantus really has a flat line response and moving it back 2 hours really shouldn't affect your morning numbers. BUT, being a novorapid user, Im going to guess that you eat dinner maybe about 6:30pm and take the novorapid. As you know it peaks in 20 mins but it can last 3 to 5 hours at that peak then drops off rather perciptiously. Well, lets just say it lasts 5 hours. You take your lantus and 8:30pm and you have at least a 2-3 hour overlap with the NovoRapid still in your system. This should push your blood sugar much lower than when you took the injection at 10:30pm and as a result, the natural climb from this new low to where you are in the morning puts your numbers lower than if your starting point for that same climb was higher at 10:30pm.
In any event, moving that Lantus injection to get better morning numbers was a really smart thing to figure out and points out something really important to anyone using injectibles; DONT BE AFRAID TO EXPERIMENT with timing!!! Everyone is different and has different absorbtion/reaction times and what the doctor tells you about dosage/timing is a NORM and may be very different for you! Claire just proved this.