| I agree with Gary. First you must do basal testing. Lantus doesn't last 24 hours for me, either, but I was able to confirm that through basal testing.
Taking it at night, I was high in the late evening, about 20-22 hours after the last lantus shot.
It can be successfully split, I did it about a year ago and it made a huge difference.
I split it 50/50, taking it 12 hours apart and did lots of testing. I went from 24 units in one dose to 16 in the AM and 4 at night. But I'm odd...LOL
I strongly suggest you get a copy of Using Insulin by John Walsh. Not only does it thoroughly cover basal testing, but there is also some discussion about splitting lantus.
That book was THE tool that finally helped me get my blood sugar under control.
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~Holly~
Incorrectly dx'ed type 2 7/00 
Correctly dx'ed type 1 5/01
MDI
Lantus 2x daily & Humalog
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