@Antje77 They will replace it, but it's a pain to replace it right before bedtime and then you can't trust it's accuracy for the night or the next morning. Then you have to do a finger stick test to tell what you are actually at because you don't have a clue how far off it will be.
I put the new sensor on right away last night and figured I'd start it after getting up this morning to give it some time to bed in. I've never had a nighttime hypo in over 4 years I've been using the Libre (except for that one lantus Low, but that doesn't count) so no issue to skip a night. Only downside is no alarm if I start to rise in the early morning, but I haven't needed a correction during the night in the past 6 days or so, so chances were I wouldn't need it this night either.
So I went to sleep without worries, and even if I would rise due to DP, so what, it's only one day and I don't expect to rise over 9 even if it happens.
Woke up, did a finger prick, 3.8! Whut???
I always need a couple of units for Foot on the Floor, so I figured I'd just get up, make coffee, feed the goats, chickens, guinea pigs and bunnies to give FOTF a head start, and dose for it by the time I sat down with my coffee.
Grabbed my Reader to start the sensor only to have it say the sensor had already been started with another device. Huh? Checked my phone to see I apparently started the sensor at 5AM.
I must really be taking my diabetes very seriously if I even scan in my sleep!
So now I have a sensor which will end in the middle of the night, and no reader for the next two weeks. Not a big issue, the first thing will be easily rectified by sleeping and only starting the sensor after waking up, losing a few hours of data. The second thing is more annoying: I use the reader twice a week when swimming. It sits in a waterproof bag on the edge of the pool, next to an apple, and halfway through I just swim to the side, scan, have a couple of bites of my apple if dropping, and never even need to get out of the water.
This is possible with my phone as well, but it doesn't like to be handled through the bag so it's a fight to make it scan.
Not the end of the world, but still one of those pesky little diabetic annoyances.
By the time I sat down with my coffee I felt slightly shakey, fingerprick said 3.7. So instead of the expected insulin I had a swig of milk, which took me up to a comfortable 5.1, and FOTF never came.
Very odd, the one night in years I don't have my Libre is the only time ever I had a nighttime hypo, and the only time I didn't have FOTF.
At least my BG's are nice and stable so I can calibrate DiaBox!