What a nice surprise!
I had relaxed a bit the night before with a couple of glasses of wine
However, keep in mind alcohol can lower BG well into the next day. As long as the liver is busy dealing with the alcohol it won't dump glucose in your bloodstream, this effect can be noticable well into the next day!
While this can help getting nice low numbers, it can also cause problems with hypos for those on gliclazide or insulin. This liver dump is the bodies first defence when you drop too low, so as long as your liver is having a party it might be harder to get out of a hypo.
Combined with a deeper sleep thanks to the alcohol, this increases the risk of the hypo not waking you up before you're very low.
Young T1's who are just starting to experiment with alcohol are often advised to have a fatty and carby snack before bed after drinking to see them safely through the night.
Which isn't of course the same situation as yours, and besides, it worked out very well for you, but it is something to be aware of on gliclazide.
Mind, I'm not at all saying to not drink, I'm an enthousiastic drinker myself, but keep in mind how alcohol can affect your BG's!
Perhaps set an alarm to do a nightly test to get an idea of what's happening overnight?