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This screw up will effect you though. You need to have plenty of fast acting sugar around for when you start to go low. And you probably most certainly will. The peak for Lantus is about 4-6 hour range so you will probably feel the better part of this low at that point and if you are prepared it will go much smoother. Only thing you can do to keep your levels up is to take in more sugar. Make sure it is fast acting like a fruit juice or Glucose tablets instead of Complex carbs. When you are in that 4-6 hour window I would suggest testing a couple times to see how you are doing. But the Lantus will effect your levels for the next 20 or so hours so you will have to reduce the Novolog that you take with any meals or even perhaps skip it if your levels are low.
Just FYI. Had you reversed the problem and taken your Novolog instead of your Lantus you would have a much more potentially serious problem on your hands. Novolog is FAST acting and Lantus is long acting. Had this been that case or if it happens in the future you would need to take a LOT of fast acting carbs IMMEDIATELY (like within a few minutes) and if that is not possible you would need to call 911 IMMEDIATELY so that you could explain the situation to them before you hit a critical point of passing out and or going into a coma.
Please post soon to let us know how you are.