noctŭābundus, a, um, adj. [noctu],
having travelled all night (cf. noctivagus): noctuabundus ad me venit cum epistulā tuā tabellarius, Cic. Att. 12, 1, 2.
noctuābundus adj. * noctuor, from nox, in the night-time, by night : ad me venit tabell...
An Elementary Latin Dictionary