Why has my blood sugar gone up overnight, if I did not eat anything? The Dawn Effect

The dawn phenomenon, also known as the dawn effect, is a natural increase in blood sugar levels that occurs in the early morning hours, typically between 3:00 a.m. and 8:00 a.m.

It affects people with diabetes and is a common cause of high blood sugar (hyperglycemia) in the morning[2]. The phenomenon occurs due to the release of hormones in the body, such as growth hormone, cortisol, and glucagon. When levels of these hormones increase, your liver is stimulated to release glucose into your bloodstream, providing your body with a boost of energy to prepare you to wake up in the morning[3].

In people with diabetes, the dawn phenomenon can potentially elevate blood sugar to dangerous levels. The main symptom of the dawn phenomenon is high morning blood sugar levels, which can cause increased thirst, increased hunger, and frequent urination[2].

To manage the dawn phenomenon, you can try eating an earlier dinner with fewer carbohydrates, adjusting your medication regimen with the help of your doctor, and engaging in light physical activity after dinner[4]. It's important to monitor your blood sugar levels and consult with your healthcare provider to determine the best course of action for managing the dawn phenomenon[12].

Sources [1] 10 Surprising Things That Can Spike Your Blood Sugar | CDC https://www.cdc.gov/diabetes/library/spotlights/blood-sugar.html [2] Dawn Phenomenon: What It Is, Causes, Symptoms & Treatment - Cleveland Clinic https://my.clevelandclinic.org/health/diseases/24553-dawn-phenomenon [3] Dawn Phenomenon: What It Means for People with Diabetes - Healthline https://www.healthline.com/health/diabetes/dawn-phenomenon [4] Tips for Taming the Dawn Phenomenon - OneTouch https://www.onetouch.com/about-diabetes/managing-diabetes/tips-for-taming-dawn-phenomenon [5] Why Is My Blood Sugar High in the Morning? - WebMD https://www.webmd.com/diabetes/morning-high-blood-sugar-levels [6] Somogyi Effect vs. Dawn Phenomenon: The Difference Explained - WebMD https://www.webmd.com/diabetes/dawn-phenomenon-or-somogyi-effect [7] Managing the dawn phenomenon - Diabetes Canada https://www.diabetes.ca/managing-my-diabetes/stories/managing-the-dawn-phenomenon [8] High Morning Blood Glucose | ADA - American Diabetes Association https://diabetes.org/diabetes/treatment-care/high-morning-blood-glucose [9] Dawn Phenomenon - StatPearls - NCBI Bookshelf https://www.ncbi.nlm.nih.gov/books/NBK430893/ [10] Why Blood Sugar Levels Rise Overnight | Glucerna® https://glucerna.com/why-glucerna/why-blood-sugar-levels-rise-overnight [11] The Dawn Phenomenon: Why is my blood sugar high in the morning? - Virta Health https://www.virtahealth.com/blog/dawn-phenomenon [12] The dawn phenomenon: What can you do? - Mayo Clinic https://www.mayoclinic.org/diseases-conditions/diabetes/expert-answers/dawn-effect/faq-20057937 [13] Dawn phenomenon: How to control high morning blood sugars - Medical News Today https://www.medicalnewstoday.com/articles/317351 [14] Somogyi Effect: What It Is, Causes, Symptoms & Treatment - Cleveland Clinic https://my.clevelandclinic.org/health/diseases/11443-somogyi-effect [15] Dawn Phenomenon (Liver Dump) - Diabetes UK https://www.diabetes.co.uk/blood-glucose/dawn-phenomenon.html [16] Why Is My Morning Blood Sugar so High? - Healthline https://www.healthline.com/nutrition/high-morning-blood-sugar [17] High Blood Sugar at Night: Causes, Symptoms, and Prevention - diaTribe https://diatribe.org/high-blood-sugar-night-what-do