LATIN DICTIONARYLexicon Latīnum
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“sleepless” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

sleepless
insomnis (that cannot sleep): exsomnis, vigilans (that does not desire to sleep). To pass a sleepless night, noctem insomnem agere (involuntarily): noctem pervigilare; noctem perpetuis vigiliis agere (voluntarily).

Quick answer

What is the Latin word for sleepless?
The usual Latin words for “sleepless” are īnsomnis, exsomnis, vigilō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.