Absolutely Victoria - have you ever checked how long your Levemir could be expected to last given the dosage and your weight on the complicated-looking graph on the website?http://www.diabetes-support.org.uk/info/?page_id=428
Your dose of Levemir divided by your weight in kgs = a rate per kg. Follow your rate per kg up the upright axis, then follow the wavy line along the horizontal one. It is true that when I was on it, my morning dose did not expire entirely until about 18-20 hours later - however, the amount left of it, still active, was not by then enough to do very much 'useful' so a top-up of a much smaller dose than the morning one, in the evening at about 14/15 hours later, saw me through the night pretty stable. Hence I took 14u morning as soon as I got up, and 4u at approx. 9.00-10.00 at night. Other people need more at night and less during the late afternoon evening and night. It's very very rare to find anyone with a 12 hour, 50/50 split in total dosage.
Because none of the so called fast acting insulins (Novorapid, Humalog, Apidra) are that fast AND they also remain active quite strongly for MUCH longer than 2 hours - if you try to correct what is really the basal insulin's job with bolus insulin as the nurse suggests - the potential for hypos during the remaining 'life' of that increased bolus, will increase A Lot until another at least 2 if not 3 hours have passed - ie 4-5 hours after that meal.
Far far more gentle on the body to 'drip' small releases of insulin in gradually, which is in fact how a normal pancreas works in the first place!
(I think someone has told Nursie that Levemir lasts all day OR that all T2s have enough insulin production of their own to cover any gaps. Or both. Unfortunately as WE all know all diabetics what ever Type, race, creed or colour they happen to be, don't do anything 'the same' ! LOL)