Watch out for the Infamous ‘Dawn Phenomenon’

Even if your reading was in the normal range when you went to bed, it's not unusual to wake up with a high blood sugar reading.

Between 2 and 8 a.m., as the body is ready for waking up by releasing cortisol and other hormones, you could be going through the "dawn phenomenon". These hormones reduce the body's sensitivity to insulin, which in diabetics might cause a blood sugar increase in the morning. On the other hand, if you use too much insulin or medicine at night or don't eat enough in the evening, your blood sugar may be low when you wake up. Shortening the fast by eating a small, protein-rich, low-carb snack before bed might occasionally help without spiking nighttime blood sugar.