Lewis Short
(adj.adv.) : somnŭlentus (somnŏl-), a, um, adj. somnus
* Full of sleep, i. e. sleepy, drowsy, dozy, somnolent (post-Aug.), App. M. 1 fin.; 10, p. 251, 37.—Hence, adv.: somnŏlen-ter, sleepily, Hier. in Psa. 118; Sol. 20, 7.
Charlton T. Lewis, Charles Short, A Latin Dictionary