My Dexcom G4 has recently been showing values 20-30 points below actual, but only in the middle of the night. Daytime readings are pretty accurate and usually vary only 5 points from fingersticks, but the nighttime readings are driving me nuts. Last night, for example, I was woken up by the alarm and a reading showing 55. Concerning to say the least, but I didn't feel hypo. I dragged myself into the bathroom all bleary eyed and did a test with my meter: 84. Of course, I couldn't fall back asleep properly and have started my week in a fog...
This has now happened several times in the last couple of weeks. My insertion sites have remained consistent for the last several months on the back of my arms and my nighttime readings have been accurate until recently.
Is this happening to anyone else? Any ideas what might be causing this?