Written by Dr.Albana Greca Sejdini, Md, MMedSc

Medically reviewed by Dr.Ruden Cakoni, MD, Endocrinologist

Normal level at bedtime (91), up 35 points in morning (145).

by Frances Rose
(Nashville, NC (USA))

QUESTION: Why is my Blood sugar 91 when I go to bed at night and 145 when I get up in morning? Nothing to eat or drink during night.

ANSWER: Hi Frances,

I understand your concern.

Your blood sugar at bedtime is completely normal (91 mg/dL). During the night, you are not eating or drinking anything.

In the morning, you find your blood glucose as high as 145 mg/dL.

Ok, there are 2 main explanations for this:

1. Morning hormones: they include cortisol, growth hormone, chatecholamines.
They get higher in early morning. They induce the production and secretion of sugar from liver with high blood glucose as consequence.

In non-diabetic people, this high blood sugar is associated with increased insulin production and secretion to lower it.

If cannot produce enough insulin, the result is having high morning blood sugar levels. This is called Dawn Phenomenon.

2. Somogyi effect: in early morning, blood sugar is very low as response to insulin.
Your body reacts by realeasing morning hormones to increase blood sugar.

When you measure early morning, you find your blood glucose raised.

Now, what I suggest to my patients is to measure their blood sugar levels in the first hours of morning (e.g. 2 to 3 a.m), and record the results.

If your blood sugar at this time is low, then, you get high blood sugar in the morning due to Somogyi effect.

This can be corrected by having a snack at bedtime.

If blood glucose is normal at 2 to 3 a.m, then, this is Dawn Phenomenon.

I'd suggest to measure HbA1C level to evaluate your blood sugar average within the last 3 months.

Hope this helps. Let me know if you have further queries.


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Jul 15, 2018
What type of Snack and how much?
by: Anonymous


The suggestion of a snack is made.

What type of snack and how much?

Thank you

Aug 21, 2018
Fasting sugar 120, PP 190, take sweets reaches 260
by: Kapil

HELLO: Hello sir,

My fasting sugar is 120 and pp is 190 . when I take sweets, it reaches 260 ...

Should I take medicines? Age is 42.


Oct 12, 2018

by: Dr.Albana

Hello Kapil,

I have gone through your sugar levels carefully and here's my answer.

It seems that your blood glucose spikes when eating sweets. In fact, there is alteration in blood sugar levels.

The next step is to run HBA1C test to determine the mean of your blood glucose within the last 3 months.

Next, at your age we should exclude metabolic and hormonal problems first.
So, should run various blood tests including:
- complete blood count
- thyroid function test
- liver/kidney/pancreas function test
- urine analysis
- blood electrolytes
- blood vitamins B, D, calcium levels

After evaluating the results, we can make the best treatment strategy.

For the moment, I can only suggest to make some changes in your diet and lifestyle regimen first.

Hope this helps. Looking forward to have the requested lab tests reports in.


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