Only false alarms and 2 x in the night (1 x 60 + 1 x 62 sugar) displayed nothing, although by the book - after 5 minutes lying in bed - on. My daughter is in July Type 1 diabetic and still has very strong fluctuations because their own pancreas has not completely given up the ghost. We had hoped to be able to sleep a little quieter with the bracelet, but that's exactly the opposite is true. 4 alarms - the values between 100 and 135-2 times not displayed although the always lying around the 110 - then dropped to 60 and 62 and no beep is enough for me now.
