The first questions that poped into my mind was:
What and when do you eat before bed
What fast acting insulin do you take with it and how much?
When do you take your Lantus and how much?
High BG in the morning as my brother had during a long period was due to a bolus injection prior to bed to take down a high BG, but he clearly took to much and had a low during night and woke up with rebounds.
How long have you had high BG in the morning? It could be a result of a luring cold aswell.
The text here under is some cut from the web:
Dawn phenomenon.
The dawn phenomenon is the end result of a combination of natural body changes that occur during the sleep cycle and can be explained as follows. Your body has little need for insulin between about midnight and about 3:00 a.m. (a time when your body is sleeping most soundly). Any insulin taken in the evening causes blood sugar levels to drop sharply during this time. Then, between 3:00 a.m. and 8:00 a.m., your body starts churning out stored glucose (sugar) to prepare for the upcoming day as well as releases hormones that reduce the body’s sensitivity to insulin. All of these events happen as your bedtime insulin dose is also wearing off. These events, taken together, cause your body’s blood sugar levels to rise in the morning (at "dawn").
Somogyi effect.
A second cause of high blood sugar levels in the morning might be due to the Somogyi effect (named after the doctor who first wrote about it). This condition is also called "rebound hyperglycemia." Although the cascade of events and end result – high blood sugar levels in the morning – is the same as in the dawn phenomenon, the cause is more "man-made" (a result of poor diabetes management) in the Somogyi effect. There are two potential causes. In one scenario, your blood sugar may drop too low in the middle of the night and then your body releases hormones to raise the sugar levels. This could happen if you took too much insulin earlier or if you did not have enough of a bedtime snack.
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