While we sleep, we are in our most fasted state (generally) because we are not eating or drinking during that time. Glucose will naturally be lower and the sensor hardware itself is less accurate in the lower range. This is also why we are often looking at trends and scores at Theia and not always going by exact glucose levels.

In addition, pressure from sleeping position is one of the most common reasons we see it going low! 

There are some other very common reasons we may see glucose going low that includes: more variability in glucose during that day that carries through to the night, late evening meals or drinks, alcohol, medications or supplements, microbiome, other hormones at play, inflammation, illness, and more! 

When we have days that we are showing less variability (swings in glucose up and down) and averaging a lower glucose, we may naturally show lower overall glucose and dip below 70 mg/dL more often than we might expect. 

If the sensor has an error, loosened, or stopped working correctly, we may see that show up as inaccuracies as well and please reach out to us if you suspect this.