Herodotus, Histories 1.133.3-4
“The [Persians] are really fond of wine. It is not permissable to puke or to piss in front of another—these things are guarded against. And they are in the custom of taking counsel about the most important matters while they are drunk. Whatever seems fit to them while they are deliberating, the housemaster of the place where they deliberate proposes to them on the next day when they are sober. If the idea is pleasing to them when they are sober too, then they adopt it. If it is not, they waive it. When they have debated an issue while sober, they make a final decision while drunk.”
οἴνῳ δὲ κάρτα προσκέαται, καί σφι οὐκ ἐμέσαι ἔξεστι, οὐκὶ οὐρῆσαι ἀντίον ἄλλου. ταῦτα μέν νυν οὕτω φυλάσσεται, μεθυσκόμενοι δὲ ἐώθασι βουλεύεσθαι τὰ σπουδαιέστατα τῶν πρηγμάτων:
 τὸ δ᾽ ἂν ἅδῃ σφι βουλευομένοισι, τοῦτο τῇ ὑστεραίῃ νήφουσι προτιθεῖ ὁ στέγαρχος, ἐν τοῦ ἂν ἐόντες βουλεύωνται, καὶ ἢν μὲν ἅδῃ καὶ νήφουσι, χρέωνται αὐτῷ, ἢν δὲ μὴ ἅδῃ, μετιεῖσι. τὰ δ᾽ ἂν νήφοντες προβουλεύσωνται, μεθυσκόμενοι ἐπιδιαγινώσκουσι.
Tacitus ascribes a similar process to the northern barbarians, concluding (Germ. 22):
“therefore, the mindset of everyone has been exposed and made clear and on the next day the issue is discussed again, and for each opportunity a resolution and accounting is reached. They deliberate when they are incapable of lying; they make a plan when incapable of messing it up.”
ergo detecta et nuda omnium mens. postera die retractatur, et salva utriusque temporis ratio est. Deliberant dum fingere nesciunt, constituunt dum errare non possunt.
[Credit to Perseus for having the How and Wells Commentary online]