Sometimes I get 'hypos' at night with the Libre, where the line plummets into the red zone.
But they aren't really hypos. They seem to be where I am lying on that arm, and the sensor is being squashed, giving a false reading.
Obviously, I can't tell whether your hypos are real or not, but if you are getting low readings only when you are lying in a certain postition, then that may be what is happening.
When I have a real hypo at night, the graph curve usually looks different, and more like a daytime hypo.