Plutarch, De virtute et vitio, chapter, section 2 6:

καὶ γὰρ ὃ καθεύδουσι, τοῦ σώματος ὕπνος ἐστὶ καὶ ἀνάπαυσις, τῆς ψυχῆς πτοῖαι καὶ ὄνειροι καὶ ταραχαὶ διὰ δεισιδαιμονίαν.??