Why would my BG level go up while I'm sleeping? I have type 1 diabetes.
The body gets glucose in two main ways: from the food we eat and from the glucose that is made in the liver. The first, and most common, reason blood glucose levels can go up overnight is that there is not enough insulin in the body to help use the glucose coming from the liver. Check your blood glucose at bedtime and in the morning; if you find it consistently goes up overnight, you probably just need more basal insulin at bedtime. A second reason blood glucose levels can go up overnight is that you are having low blood glucose levels in the middle of the night and are not aware of it. If you are having lows and sleeping through them, the body will correct the low by having the liver make more glucose. If your blood glucose pattern is up and down in the morning, then this may be a sign that you are having lows in the middle of the night. The best way to rule out overnight lows is to do some middle of the night checking. Check at bedtime, at 3 am and when you get up. If you find your blood glucose is dipping during the night, it may be that you are having rebound highs in the morning. The third reason people can experience a rise in blood glucose in the morning is due to the “dawn effect.” Stress hormones are released in the early morning hours to help the body wake up. These hormones cause a natural rise in blood glucose in the morning. Checking at 3 am and when waking up should tell you whether this might be happening to you. If you think it is, then talking to your doctor or nurse about how to adjust your insulin overnight should help.