From Pawnee, Illinois, USA:
My blood sugar reading is lower when I go to bed than after an all night fast. Is this normal? What can be causing this?
The phenomenon you describe is very common. Low blood sugar after eating generally results from too a large dose of insulin for that given meal (i.e., dinner) while the next fasting blood sugar is sustained mainly on the liver's of glucose during the night. This is called the dawn phenomenon. It's caused by counterregulatory hormones (cortisol, growth hormone) released over the early period of the night (from about 12:00 midnight to 3:00 am) that subsequently activate the hepatic gluconeogenesis (de novo production of sugar by liver). If you go to bed with too a low blood sugar this will often potentiate the dawn increase in blood sugar. Try to go to bed with a little bit higher blood sugar and see whether this stabilizes your fasting blood sugar.
Original posting 30 Jan 2001
Posted to Daily Care
Last Updated: Tuesday April 06, 2010 15:09:18
This Internet site provides information of a general nature and is designed for educational purposes only. If you have any concerns about your own health or the health of your child, you should always consult with a physician or other health care professional.
This site is published by T-1 Today, Inc. (d/b/a Children with Diabetes), a 501c3 not-for-profit organization, which is responsible for its contents.
© Children with Diabetes, Inc. 1995-2015. Comments and Feedback.