@pyratepate – When I was on MDI I had major problems with nighttime hypos. I shifted my entire Lantus to the morning, which almost eradicated them, but did leave me with a major dawn phenomenon – as @Tim
I agree with Tim – ring (and ring and ring) your diabetic clinic/specialist/nurse; dont rush into doing anything, let any change settle in before you decide it doesn’t work. And test! Test every couple of hours, before every meal, 2 hrs after every meal, before bed, whenever you can. The more tests you have, the more obvious a trend will become.