What is the optimal method of diagnosing Somogyi effect? After how many hours of sleep should blood glucose be measured? and when should the next measurement be?
The Somogyi effect can occur any time a person 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.
If the blood sugar level is low at 2 a.m. to 3 a.m., suspect the Somogyi effect.
If the blood sugar level is normal or high at 2 a.m. to 3 a.m., it's likely the dawn phenomenon.