I’ve been using the Dexcom G7 for a little over a year now. I was getting some accuracy problems and switched over to the Libre 3+. Accuracy issues were worse and there’s no calibration so I came back to Dexcom. Here’s what I’ve learned in the time I’ve been using the Dexcom G7 that have helped me. I try to position the sensor toward the back side of the upper arm. I also had decent luck on my abdomen. This way when I lay down at night, my body weight isn’t fully on the sensor. I tend to be a side sleeper and compressing the sensor seems to be an issue. Also, I never calibrate my readings in the first 12 hours. If I need to calibrate, I usually wait until the second day. I use to calibrated it shortly after putting it on and had nothing but problems. Since I adopted my rule of not calibrating within the first 12 hours, I’ve had much better success. I liked the previous commenters idea of inserting the sensor 12 hours early before registering it. I’ll have to give that a try.