I've asked this question myself. If you only have a SMALL glass or 2 dry white wine like Sauvignon Blanc you should be ok, as long as you have a small snack with it to balance out any drop. Remember to drink lots water before bed and do your checks, if low, have a cracker, but best check with your nurse. I know white spirits and dry wine is best as low carb. Beer, lager and cider has sugar in, so avoid those if poss. Also, as alcohol remains in the system the next day, keep careful watch on levels then too.