My normal split is 20u evening, 15u morning. I used 35u last night as I knew that my 20u from the night before was all but done.
The last NovoRapid was taken at around 5pm.
As you can see, what appears to have happened is that while the Lantus starts to work relatively slowly, and then whilst asleep, maintains a steady BS drop (which I would expect to be less steep on 20u than on 35), and there is tiny Dawn blip up, once I have woken up and started moving around, it really started to accelerate. This was a bit of a surprise to me, but explains some of my previous early morning experiences. Note that I went to the gym last night between 8.30pm and 9.30pm. I will do the same tonight.
This evening I'll return to my usual split and see what happens.
Having this level of detail regarding the shape of blood sugars is brilliant and extremely helpful in making decisions about how one self treats. It feels like true enlightenment!