So I'm doing a trial of Dexcom this week, and yesterday was my first day. I was pretty impressed with the accuracy so far... until bedtime. Then, it started looking less and less accurate... until it woke me about a BG of 350, which I tested in a hurry to see... 115? Double test... 111?! WTF?
It looks like, after a bunch of up and down readings, it lost reception somehow (no idea if it was showing the reception symbol or the ???), then popped in with only that 350, then it went to ??? for an hour or so (I was just dosing after that 350, so I periodically peeked to see if the ??? was still there), then came back online an hour before I got up and gave me more steady, probably accurate readings. And it's been fine this morning.
So, Dexcom, I say to you: ???
I've read somewhere that sleeping on the sensor can cause problems, but would it cause innaccurate readings? I figured it would just cause poor reception. I put this trial sensor on the side of my stomach where I almost always sleep, so there was a good chance I was lying on it at the time. I may have to arrange a pillow so I don't roll over tonight, and see if it's more accurate when I'm not on top of it.