Pausanias, 1.21.1
“I think that the statue of Aeschylus was made much later than his death and the painting which shows his effort at Marathon. Aeschylus says that when he was young while he slept in the field to guard the grapes, Dionysus appear to him and ordered him to compose tragedy. When day came—since he wanted to obey the god—he set out to compose with great ease. He’s the one who used to say these things.”
τὴν δὲ εἰκόνα τὴν Αἰσχύλου πολλῷ τε ὕστερον τῆς τελευτῆς δοκῶ ποιηθῆναι <καὶ> τῆς γραφῆς ἣ τὸ ἔργον ἔχει τὸ Μαραθῶνι. ἔφη δὲ Αἰσχύλος μειράκιον ὢν καθεύδειν ἐν ἀγρῷ φυλάσσων σταφυλάς, καί οἱ Διόνυσον ἐπιστάντα κελεῦσαι τραγῳδίαν ποιεῖν· ὡς δὲ ἦν ἡμέρα— πείθεσθαι γὰρ ἐθέλειν—ῥᾷστα ἤδη πειρώμενος ποιεῖν. οὗτος μὲν ταῦτα ἔλεγεν·
This seems simply to confirm the age-old association of artists and substance abuse.