how much mg is there in those metformin pills ?
if it all in all does not exceed 2000mg , I think you after you have asked a doctor, that you can just eat very much carbs before you sleep, so you are sure not to be too low when you sleep, but metformin does only lower ones blood glucose a bit so I don´t think it is very dangerous if it is only for one day... worse would be overdosing for a longer period... but if you have taken more than 2000-2500 mg I think it can be very important to ask for advice.. as that is the maximum dosis for a day ...