losing hypo awareness

I seem to be losing awareness this winter . i don't no if it the cold weather ..if i'm sitting about at home and not doing much maybe watching TV .
i tend not to put my heating on i might wear a woolly hat on keep warm. The hypo seems to creep up. yesterday 3.00 o'clock BG down to 2.5 today 3.7 but with no symptoms i no this is my danger time of the day but I've always had symptoms. do you think that it might be because i changed from lantus to Levemir But this change of insulin was done last summer .

noblehead said:

I very much doubt it if you changed last summer, but you can never say for certain. Have you had a lot of hypo's of late as this can reduce your hypo awareness symptoms; as you probably already know Caretaker the usual advice is to run bg levels higher for several weeks (whilst avoiding any lows with careful monitoring) to restore the symptoms.

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thanks
starting the pump on the 17 march (saline trail )
so there no real need to worry
i'll just run a bit high and test before 3 oclock