I’ve had similar problems over the last couple of years. If you’re sure you haven’t gone hypo overnight (it really is worth testing tho…) it could be that your lantus is too low- that’s assuming you inject it in the evening. You could try adding 1 or 2 units for a few days and seeing if that has any effect on morning BGs. Obviously you would have to test more than usual and be more careful with the humalog (that’s the disclaimer as I’m not a doctor!) I was very surprised at the different 2 units made.