Diabetes Type 2 Support Group
Type 2 Diabetes is a condition in which the body either does not produce enough insulin or does not make efficient use of it. Insulin is a hormone needed to convert food into glucose, a sugar that the body uses for energy. Without enough insulin, glucose can accumulate in the blood, and can cause serious health problems such as heart disease and strokes and organ damage...
I used about 1/3 to 1/2 of the recommended dose and it did help with the sleep and no impact on bg levels. I should stress, however, that I only used it a handful of times. There may be more impact with consistent use.
http://www.drugs.com/melatonin.html