fasting blood glucose levels, the reading taken first thing in the morning before consuming any calories. Naturally, it would seem that blood sugar should be lowest in the morning because you haven't had anything to eat in so long. That's why it can be so confusing when blood sugar is highest in the morning.
But as our bodies begin to get ready for a new day, they release stored glucose as well as hormones like cortisol and growth hormones. These hormones counteract the effects of insulin - they cause a rise in blood sugar levels instead of dropping them. The combination of the release of stored glucose, the release of hormones, and the bedtime dose of insulin wearing off results in a rise in blood sugar levels.
So when you wake up in the morning, your blood sugar is high. Most people don't realize this is happening and only find out when they wake up and take a blood sugar reading.
High morning blood sugar can be caused by taking too large a dose of insulin at bedtime, for example, or eating too small of a bedtime snack. This causes blood sugar levels to drop too low, triggering your body to release hormones to counteract it and bring blood sugar levels back up.
Another way high blood sugar can happen is if the bedtime insulin dose is too small. Without sufficient insulin, blood sugar levels will remain high.
Before figuring out what can be done about high blood sugar in the morning, you need to know what's causing t. Your doctor may ask you to check your blood sugar early, typically between 2:00am and 3:00am, for several nights in a row. If there is a consistently a low reading, then it's likely rebound hyperglycemia. If the readings are consistently normal or high, then it's more likely to be the Dawn Phenomenon.
Discuss with your doctor how to manage high morning blood sugar. Options can include:
Be sure to keep good records of your blood sugar readings, along with notes about diet, exercise, medication, etc. so that you can see what's working and what is not. Your doctor or diabetes educator can advise you on what changes to make to your diabetes treatment to try to prevent the issue where blood sugar is highest in the morning. It can take some experimentation and time but it can usually be resolved.