Hi there,
In my opinion, your problems probably stem from some combination of the phasing of your basal dose, your elevated blood glucose levels, and perhaps the Lantus itself.
First off, 10mmol/l is not a safe bg level at any time and you'd benefit from getting that down to something in the 5's or 6's. That will have all sorts of long term health benefits.
Secondly, Lantus isn't really designed to lower your blood sugar as you are using it. That might sound odd, but its real pupose is to counteract the glucose your body makes all by itself. If a Lantus dose is correctly set, it should be able to keep your bg at a pretty stable level throughout the day without eating any food at all. Yours is, or was, lowering your bg by a few points overnight so may well be set too high.
Thirdly, Lantus doesn't work for 24 hours in many people. Its action can be finished in as little as 18 hours, which will leave a 6 hour period during the day when bg levels creep up without actually eating anything. A good solution to this is to split the dose in two, separated by a few hours.
This would enable you to go to bed at a healthier bg level, use less Lantus overnight so that your bg is much the same the following morning, so avoiding possible hypos. Then simply take the balance the following morning so that your numbers stay stable during the day.
I'm not convinced your bg will have started high at bedtime, fallen off the cliff overnight, and leapt up again by morning. It's never happened to me in 29 years, but we are, as they say, all different. It may be more likely that it simply started high, then kept rising.
Finally, there are those who simply don't do well on Lantus and do better with an alternative basal.
I've used Lantus and Levemir and personally found no difference, but it's something to consider if you keep experiencing problems.
All the best,
fergus