Like "I am a type 2 diabetic and I take humlog and lantus insulins. It's not that I'm thirsty it's that my legs go into spasms I think when my blood sugars are too high and usually it happens during the middle of the night. So maybe I'm not taking enough insulin at bedtime. My doc's don't seem to know what causes the spasms ! go figure; but through a process of elimination I think that it's fluids that my body needs when that happens."