If you do not have another tester buy some of the Neo test strips that work with the reader and a lancet device. Odds are your sensor is reading lower than you really are. Mine sometimes read 25 or more points lower at night. So I would get alarms for low blood sugar when its fine. It can't be set lower than 60 on my U.S. reader so it will alarm below 60 while my blood sugar is still above 80. I turned the alarm off since I do wake when low.

Sounds like that would not work for you, the reader cannot be set low enough to avoid false tripping.

Sleeping on or putting pressure on the sensor can cause compression lows, the fluid is compressed away from the sensor in those conditions.

Which I am not doing, I even put up a camera one night to see and during the time mine was displaying low I was sleeping soundly on the other side. Maybe you are sleeping on it?

What I use it for is to see how I am doing, if it says I am real low or high I rest with strips to see what is really happening.

And it seems to vary depending on the sensor. I had a few that were real close to what the test strips say and others that were always off.

Probably not what you wanted to hear but it does sound like yours is reading lower than you really are. Only way to tell is with test strips.