This is too weird for words. I've attached the pictures of the 3, 6 and 12 hour Dexcom screens. I put in a new sensor last night before she went to bed, which is why the 12 hour screen starts where it does. When the Dex was ready to be calibrated, I put in both readings of 110 and 118. When I checked her 2 hours later she was in the 100s again with 2 arrows down, and she had this huge spike up into the 350s. I've never seen a rise and fall that big within 2 hours. (She had dinner IOB, but got no correction for that spike) I gave her a couple ounces of juice, but she didn't have any IOB by the time I checked her the 2nd time so I didn't think she'd keep falling. The rest of the night went the same, with another huge spike into the 300s, and smaller spikes up to 200 and back. I heard the Dexcom alarm a couple times in the night because it said her bg was falling. (she never got below 100 though) and when I checked her with the meter it was pretty accurate. I never corrected for any of those spikes, because I didn't see them until the after the fact. I only woke up to the falling alarms. I haven't changed changed her nighttime basal settings in a while. And the last 2 nights she had beautiful, steady, in range overnight numbers. So I was feeling pretty awesome about these basal settings. But this? What in the world is this?