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Could you please explain the dawn phenomenon. And how it affects blood sugar numbers?

A DiabetesTeam Member asked a question 💭
Rocky Face, GA

I always check my blood sugars and few minutes after getting up. Before coffee, water or anything and before the dawn phenomenon.

August 29
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DiabetesTeam

The dawn phenomenon is a common reason why fasting blood sugar can be higher in the morning, even when you've done everything right the night before. It affects about half of people with diabetes.

Here's what happens: in the early morning hours (roughly 3–8 a.m.), your body releases hormones like cortisol and growth Show Full Answer

The dawn phenomenon is a common reason why fasting blood sugar can be higher in the morning, even when you've done everything right the night before. It affects about half of people with diabetes.

Here's what happens: in the early morning hours (roughly 3–8 a.m.), your body releases hormones like cortisol and growth hormone. These signal your liver to produce extra glucose to help you wake up and get going.

For people without diabetes, the pancreas simply releases more insulin to balance things out. But with diabetes, that response may not work as well, leading to higher-than-normal fasting glucose levels. There are a few reasons the dawn phenomenon might hit harder for some people:

- The body doesn't produce enough insulin naturally
- Higher insulin resistance
- Evening insulin dose or medication isn't quite right
- A carb-heavy dinner or bedtime snack

Some natural ways to help manage it include:

- Eating a low-carb dinner to avoid overnight glucose spikes
- Light exercise after dinner — the blood sugar-lowering effects can last through the night
- Not skipping breakfast — eating in the morning can actually help lower the hormones working against insulin
- Improving sleep quality and duration — research links better sleep to lower A1c levels

If morning highs persist despite lifestyle changes, it's worth talking to a doctor. They may suggest adjusting medication, insulin timing, or even an insulin pump, which can be programmed to deliver extra insulin during those early morning hours.

August 29
A DiabetesTeam Member

@A DiabetesTeam Member
Those GLP-1s are great for helping bs. They aren't for everyone though. Some ppl can't tolerate the side effects. Thank you for sharing this.

August 29
A DiabetesTeam Member

When it comes to Dawn phenomenon, it may mean that your blood sugars are higher in the morning than they are at night. I’ve saw that before I started taking my GLP one that my blood sugars were higher in the morning than they were at night. That’s what it means to me, and it means that my blood sugars are higher in the morning.

August 29
A DiabetesTeam Member

For me I have a Dexcom so as soon as I awaken my phone is not far away and the app has area where you can click your fasting as well as other helpful keep track of what diabetes things that go on during the day. I can login my how I’m feeling, still figuring out how to put in meals.
Grateful

August 29

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