Hi I was like you on Lanctus ( normally ) 24 units , and like you I was experiencing lows at night , I also felt that it was inconstant in its “ existence time “ . I spoke to a diabetic consultant during a routine appointment and he agreed that Lanctus was found to be inconsistent , so he changed me to Levimir, the only difference is I had to split my doses so instead of taking one before bed I now take two 12 hours apart. I find it much better. As far as dosage is concerned instead of the 24 units of Lanctus I now take 12 units of Levimir twice a day, however like all insulin dosages I alter them as required.