I would suggest this phenomenon is very rare indeed. In fact my own experience tells me that the opposite situation is the norm - i.e., gross underdosing of Type 1 Diabetics. When at the ************* Hospital Swindon a year ago my blood sugar was kept over 20 most of the time and nothing I could say would persuade nurses to address this. One experienced nurse told me "Oh, we always keep our diabetics around 25. I befriended one diabetic there who slept continuously - another reason the nurses favour the policy - and heard the nurses state his BS as dangerously high with no concern from them. He was in hospital having diabetic complications operated on and in effect his next such problem was being caused right there in the hospital.
Not all hospitals are as careless as ****. I had a triple bypass last christmas and the hospital were happy to let me take charge of testing and administering my medications. This, I believe, should be standard policy everywhere. Nurses and doctors do not have the time or interest to watch diabetics control.
George Tomkins