Dawn phenomenon, is also called dawn effect, which is the term used to describe an abnormal early morning elevate in blood sugar — usually between 2 a.m. to 8 a.m.
Some researchers believe the natural overnight release of the so-called counter-regulatory hormones, such as growth hormone, cortisol (stress hormone), glucagon and epinephrine (exciting hormone) — aid in insulin resistance, causing blood sugar to rise. High morning blood sugar may also be caused by insufficient insulin the night before, insufficient anti-diabetic medication dosages or carbohydrate snack consumption at bedtime.
There are few reasons our body release such anti-insulin hormones…
1. Body is doing repair and renew jobs during resting state.
2. Depending on what activities is in your dream, it might trigger stress hormone (cortisol) or adrenaline hormone that need sugar to helps you to regulate heart beat and brain activities
3. May be the room temperature is too cold for your body. So it releases glucose to help maintain body temperature.
Look like after all, early morning high blood sugar is not that worrying. Perhaps low blood sugar should be more alarming.
P/S: If you are not sure. may be you can measure your sugar level after a warm sea salted water to jump start your day.
Hope the video below explained by a medical doctor help to reduce your anxiety.