Well, you could eat right before you check it, then it would no longer be fasting :)

If your fasting is < 110, I wouldn't change anything.  If you are consistently > 110, I would next look at your HgBA1C- if < 6.5 or trending down, I wouldn't change anything.  If you are trending up, next look at your body weight.  If you have been losing weight, then a small increase in NPH will help (2 units for every 50 over 100, so +2 up to 150, +4 150-200, etc. UNLESS you have a history of hypo, then scale 1 unit for every 50).

Now, if you have been gaining weight, increasing the NPH should be the last resort, because it can make you gain even more weight.  So in this case, I would first make sure you're not eating too much CHO before bed.  And next, you might want to check a middle-of-the-night sugar to make sure you're not rebounding high in the AM- if very high at night, it is hormonal; if low, then you are rebounding, and less NPH can actually lower your AM!

Overall, if you're not running very high in the AM, you are probably doing well- I wouldn't sweat it.  Again, if you have been gaining weight, overall diet and exercise over time can bring your fasting down.  Best of luck- and remember- the quickest way to fix a fasting of 180, is to turn the meter upside down- voila- 081!