When blood sugar is too high, your kidneys try to flush out the excess glucose through urine, making you urinate far more frequently than normal. This is especially noticeable at night — if you're getting up 3 or more times to use the bathroom, it could be a sign of hyperglycemia. This excessive urination (polyuria) creates a vicious cycle: you lose fluids, become dehydrated, drink more, and urinate even more.