I get nighttime lows. What Insulin regimen changes help me?

Question

Hello doctor,

I am 26 years old and was diagnosed with type 1 diabetes two years ago. My fasting glucose stays around 140 mg/dL, and post-meal readings are sometimes over 220 mg/dL despite Insulin.

I am currently on basal-bolus therapy using Insulin glargine and Aspart. Recently, I have noticed more frequent lows at night and morning headaches. I also feel unusually fatigued even on days when sugars seem fine. So, I would like to clear my doubts -

Could this be related to Insulin timing or possible complications starting to develop?
Should I get a C-peptide or any other test done again to reassess?
What changes in my Insulin regimen or lifestyle would you suggest?

Kindly help.

Answer 1

Hello,

Welcome to icliniq.com.

I read your query and can understand your concern.

You are experiencing a mix of hyperglycemia during the day and possible nocturnal hypoglycemia, which can definitely cause morning headaches and fatigue even when your daytime glucose readings seem reasonable.

In type 1 diabetes, managing blood sugar requires fine-tuning both Insulin dosing and timing, and your current pattern suggests that your basal Insulin dose may be too high overnight. In contrast, bolus doses need better alignment with meals or carbohydrate intake.

Frequent overnight lows could also cause a rebound effect, sometimes referred to as the Somogyi phenomenon, where early morning sugars rise after nighttime hypoglycemia. I suggest monitoring glucose levels around midnight for a few nights to see if dips occur.

Continuous glucose monitoring can be especially useful for identifying patterns like this and reducing unrecognized lows. While C peptide levels can provide some insight into residual Insulin production, they are typically very low in established type 1 diabetes and may not change your management at this point.

More importantly, reviewing your Insulin-to-carbohydrate ratios, correction factors, and timing of both basal and bolus doses with your endocrinologist or diabetes educator could help improve control.

Lifestyle adjustments may also help reduce fluctuations, which include -

Consistent meal timing.
Carbohydrate counting.
Adjusting evening activity or snack routines.

If fatigue persists despite good glucose control, other factors like anemia, thyroid function, or sleep quality should also be evaluated. Regular monitoring and small, gradual Insulin adjustments often make a big difference in achieving more stable glucose levels and reducing daily symptoms.

I hope this helps you.

Take care.

Regards.