I have had Type 1 diabetes for the past 10 years. I never seemed to have this problem before but in the past couple months, every time I stand up after either sleeping or sitting down for a while, I get extremely dizzy and feel like I'm going to black out. It used to last for about five seconds and then I was fine, but today I actually did black out. After it happened today, I quickly checked myself and my blood sugar was in a normal range. Does anyone have the same problem? Is it related to my diabetes or is it caused by something else? Thank you for your response.