Last night, my glucose level was 132 when I went to bed, but when I got up my glucose level was 167. This is the first time that's ever happened and I want to know why it might have happened. I am type 2 and on oral meds.
Assuming you did not snack or have a beverage containing glucose , it is likely that it is your liver causing this rise in blood glucose from bedtime to morning. The liver makes glucose naturally overnight to keep blood glucose levels from dropping too low while we sleep. This is normal and everyone experiences it. Insulin helps regulate how much glucose the liver makes. When insulin levels are low, as happens with diabetes, the liver does not know when to stop making glucose. In effect, too much glucose is produced, particularly overnight, so blood glucose levels can go higher overnight even though you haven’t eaten. A medicine called “metformin” can help with this. If you already take this medicine, talk with your doctor about whether or not you are taking the maximum dose. Other medicines, such as insulin, can also help. But before assuming that this is the problem, check your blood glucose several times at bedtime and the next morning. If you see there is a pattern of going up overnight, talk to your doctor about steps you can take to prevent this rise.