Usage: 1 form in 2 verses
Form Translated As     In Verse(s)
νυσταγμόν of their own slumber LXX.Jer.23.31
slumber LXX.Ps.132.4

Liddell-Scott-Jones

νυσταγμός (nustagmos) a slumber G:N-M

νυσταγμός-αγμός, ,

drowsiness, [LXX+5th c.BC+]

LSJ Scripture Refs: LXX.Ps.131.4*