Hi...I'm kind of new to this, but for the past year and a half I've been working in an elementary school helping to care for two diabetic girls. The older one is 11. When she's high, she gets crabby, cops an attitude, and cries easily. (Although maybe that's also adolescence kicking in...). The younger one is 7. When she's high, she gets hyper and has a hard time sitting still, and complains that her body hurts. I guess everyone's different, but it seems that there are behavioral clues to look for. Hope this helps!