What is the Dawn Phenomenon?

The Dawn Phenomenon is a natural, biological process where your blood sugar rises in the early morning hours, typically between 3:00 AM and 8:00 AM. Even if you went to bed with perfect blood sugar and didn't eat a late-night snack, you might wake up with a frustratingly high reading. This happens because, as your body prepares to wake up, it releases a surge of counter-regulatory hormones—like cortisol, growth hormone, and adrenaline. These hormones signal your liver to release stored glucose to give you energy for the day. In a person without diabetes, the pancreas responds by releasing a little extra insulin to keep that sugar balanced. For a diabetic, that extra insulin either isn't produced or isn't used effectively due to insulin resistance, resulting in a morning spike. To combat this, you might need to adjust the timing or dosage of your basal (long-acting) insulin, take a walk after dinner, or try eating a high-protein, low-carb snack before bed to stabilize nighttime levels. If it happens consistently, speak to your endocrinologist to adjust your medication strategy.