sleepless person sleeplessness • sleeplike · · · Info · Definitions · Synonyms · Characters · · sleepless person · · Text Common · · Latin · · Scripts 16 · · Length 4 · · Syllables Definitions · · · (noun) someone who cannot sleep. Synonyms: insomniac, sleepless person. · · Noun Definition 1 Synonyms · · · insomniac · · Synonym 1 Characters · · space U+0020 e latin small letter e U+0065 l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F p latin small letter p U+0070 r latin small letter r U+0072 s latin small letter s U+0073