Plato, Laws 808b

πράττειν τῶν τε πολιτικῶν μέρη πολλὰ καὶ τῶν οἰκονομικῶν, ἄρχοντας μὲν κατὰ πόλιν, δεσποίνας δὲ καὶ δεσπότας ἐν ἰδίαις οἰκίαις. ὕπνος γὰρ δὴ πολὺς οὔτε τοῖς σώμασιν οὔτε ταῖς ψυχαῖς ἡμῶν οὐδʼ αὖ ταῖς πράξεσιν ταῖς περὶ ταῦτα πάντα ἁρμόττων ἐστὶν κατὰ φύσιν. καθεύδων γὰρ οὐδεὶς οὐδενὸς ἄξιος, οὐδὲν μᾶλλον τοῦ μὴ ζῶντος· ἀλλʼ ὅστις τοῦ ζῆν ἡμῶν καὶ τοῦ φρονεῖν μάλιστά ἐστι κηδεμών, ἐγρήγορε

both political and economical, the magistrates in the city, and the masters and mistresses in their own houses. For much sleep is not naturally suitable either to our bodies or souls, nor yet to employment on any such matters. For when asleep no man is worth anything, any more than if he were dead: on the contrary, every one of us who cares most greatly for life and thought keeps awake as long as possible, only reserving so much time for sleep as his health requires—