Blood reading before bed

i have had good blood readings for 3 days now which is very good for me in the range of 5 to 8. Apart from my last reading before bed. It has been around the 14 mark. I have done my injection to the correct carbs that I have eaten. I inject 12 lantus at night usually around 9 to 9.30pm. I have woken up and tested around 12.30am and it's still the same. My morning reading the day after can be down to between 7.0 to 5.0. Any advice.

Oh right. This has just happened again tonight. Was 7.0 at 4.30pm, at 6.45pm was 15.3. So I have given myself another injection of 2 nova rapid. I was told to reduce my lantus was prev on 13 as had some night hypos around 2.3 to 2.9 around 2am but also on thyroxine too. Now mess for thyroxine had changed so will try 13 lantus again and see how I do. Does anyone think I'm injecting too early ie 9pm for my lantus ???