Hi
@sophc I also use the 640g
. My hypo awareness is affected by the speed at which my bg levels are changing, so if I am falling quickly then I get poor vision, sweats, shakes at around 3.8 but if it is a much slower slide then I very often don't get hypo systems until I am in the low 3's.
If you are experiencing more hypos than you did previously then you would need to review your ratios with your DSN and this could ultimately impact on your hypo awareness.