The dawn phenomenon and the Somogyi effect
cause high blood sugar levels, especially in the morning before breakfast, in
people who have
The dawn phenomenon is a normal rise in blood sugar as a person's body prepares to wake up.
If the blood sugar level drops
too low in the early morning hours, hormones (such as growth hormone, cortisol,
and catecholamines) are released. These help reverse the low blood sugar level
but may lead to blood sugar levels that are higher than normal in the morning.
An example of the Somogyi effect is:
effect can occur any time you or your child has extra insulin in the body. To
sort out whether an early morning high blood sugar level is caused by the dawn
phenomenon or Somogyi effect, check blood sugar levels at bedtime, around 2 a.m. to 3 a.m., and at your normal wake-up time
for several nights. A continuous glucose monitor could also be used throughout the night.
ByHealthwise StaffPrimary Medical ReviewerE. Gregory Thompson, MD - Internal MedicineAdam Husney, MD - Family MedicineSpecialist Medical ReviewerRhonda O'Brien, MS, RD, CDE - Certified Diabetes Educator
Current as ofMarch 13, 2017
Current as of:
March 13, 2017
E. Gregory Thompson, MD - Internal Medicine & Adam Husney, MD - Family Medicine & Rhonda O'Brien, MS, RD, CDE - Certified Diabetes Educator
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Last modified on: 8 September 2017