You should ascertain the suitability of the basal insulin dose at a time of day when you have not been exercising. Check the glucose values with a sensor or take increased self-measurements of blood sugar.
Administer the basal insulin normally and make a note of the doses.
Basal insulin during the night:
Check your blood sugar before supper between 19 and 20 in the evening.
Eat normal supper and measure out the rapid-acting insulin based on your blood sugar and the amount of carbohydrates.
Write down the mealtime insulin dose and carbs.
Check your blood sugar level using the sensor or self-measurement at 22, 24, 03 and 07.
Basal insulin during the day:
Skip breakfast and mealtime insulin and monitor your blood sugar every 1–2 hours.
If necessary, repeat for lunch and dinner.
If your blood sugar level increases by more than 2–3 mmol/l at night or when you move a meal during the day, the basal insulin is ineffective. If your blood sugar level decreases by more than 2–3 mmol/l at night or when you move a meal, the basal insulin is too effective.
Consider whether you should adjust the basal insulin dose, the time you administer it, or both. However, do not change both at the same time, so you can monitor what kind of effect each change has.