Freestyle Libre reading too low?

Just started using it. I tend to have morning effect, and I was curious to see where my blood sugar level went overnight. It showed me bottoming out around 50 mg/dL, and the current level at 101 (7 AM). A needle stick test showed me at 145, which is more consistent with what I normally see and with my current A1C level. I think my brother also has readings that are too low. DAE have issues like this? Is the error consistent, at least?