If you do need a bedtime snack I'd not bolus for it (I always used to need one when a student and out lots, but different insulins so hard to compare) and if you're already high don't have a snack, but hard to know whether to try to correct it. Depends how high I think - I'd probably do a small correction if above 11 mmol/l, but no where as much as I'd normally need - the worst that will happen is that you run high overnight and learn something about how alcohol affects you, which is much better than going hypo while drunk and asleep!