Hi, That's a really good question and one we've asked ourselves about our kids (2 of which have type 1). We've never made them fast but since they are still in the honeymoon period they subsquently only need very small doses of levemir (my son 2 and a half units at night). They then go to bed with a very small snack may be between 5 - 10gram of carb (depending what their BG is before bed). Strictly speaking the levemir should only be used as a background insulin since it is slow burning. The novo rapid should be used at mealtimes and snack times as it acts far more quickly - mimicking the pancreas. The other problem with using levemir to cover snacks is that if a snack is missed, this could result in a hypo. It also means that they will need to have a larger snack before going to bed in order to cover the extra insluin, resulting in elevated bg levels when they go to bed. You don't say how old your daughter is, but I know in my area there are a number of younger kids who take mixed insulin in the morning which covers their breakfast, mid morning snack and lunch, they then have novorpaid at tea and levemir before bed. Again this regime is not exactly mimicking the pancreas, but it is perhaps easier for smaller children who like a morning snack or when it is difficult to adminster injections at school/nursery. Leggott.