insomnietas
From LSJ
πάντα χωρεῖ καὶ οὐδὲν μένει καὶ δὶς ἐς τὸν αὐτὸν ποταμὸν οὐκ ἂν ἐμβαίης → all things move and nothing remains still, and you cannot step twice into the same stream
Latin > English (Lewis & Short)
insomnĭĕtas: ātis, f. id., for insomnia,
I sleeplessness (late Lat.), Theod. Prisc. 2, 1; Plin. Val. 1, 35.