Lewis & Short

in-somnis, e, adj. [2. in-somnus], sleepless (poet. and in post-Aug. prose).

  1. I. Of living beings, Hor. C. 3, 7, 8: juventus, Pers. 3, 54: insomnes magis, quam pervigiles, Tac. A. 1, 65: draco, Ov. M. 9, 190.
  2. II. Of things: oculi, Stat. Th. 3, 328: dens, i. e. of the dragon, from which armed men sprung, Luc. 4, 552: nox, Verg. A. 9, 167: cura, Luc. 2, 239.