κείω · keiō — LSJ
Ep. Desiderat. of κεῖμαι, βῆ δʼ ἴμεναι κείων he went to lie down, went to bed, Od. 14.532, cf. 18.428; ἔνθʼ ἴομεν κείοντες Il. 14.340; κείω I will lie, Od. 19.340; κειέμεν οὕτω that they will lie thus, 8.315; ὄρσο κέων get thee to bed, 7.342.
later, simply, sleep, rest, Arat. 1009.